The "Invisible Balance System" has been used for over 25 years, primarily for old wood windows, mill shop production windows, old single hung and double hung wooden window sashes from small and light weight - to vey large and heavy sashes; They are an excellent choice for historic window restoration and reproductions by local mill shops and fabricators to any "LEEDS PROJECTS" and renovations, Opportunity Zones Restorations and Improvements, other national and community investment groups desiring to restore and rennovate urban and rural community improvement zones across the USA.  These hidden window balances eliminate all the exposed hardware and maintains original window appearance and designs without using the antiquated weights and pully systems. This product is the favorite of the Wood working specialists, custom wood shops, residential and commercial property restoration specialists, custom work shops, specialty restoration contractors, Custom Millwork Service Companies, Millwork Fabrication and Installation Companies, Architectural Millwork Firms and Specifiers, Casework Installation contractors, window millwork installers, Custom Window [HISTORIC] Fabricators  and other custom wood window fabricators in the industry when plastic jambliner aesthetics are simply not acceptable. DOUBLE SPRING BALANCES - "AX" TYPE (Double Spring) for Different Glass Heights | Various Length of Metal Channel Balances As Needed  - All lengths, All Stamping Numbers, All Sash Weights. Units are Only Sold In Pairs, Various Standard Cord Lengths Available - MINIMUM ORDERS MAY APPLY AND PER UNIT SIZE PRICING BEGIINNING AT $ 29.99 Per Each. 

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12" 13-1/2" 101 5-7 lbs. 31" 60-A101 12" 13-1/2" 102 7-11 lbs. 31" 60-A102 14" 15-1/2" 111 5-8 lbs. 33" 60-A111 14" 15-1/2" 112 8-11 lbs. 33" 60-A112 16" 17-1/2" 121 5-9 lbs. 35" 60-A121 16" 17-1/2" 122 9-12 lbs. 35" 60-A122 18" 19-1/2" 131 5-9 lbs. 37" 60-A131 18" 19-1/2" 132 9-13 lbs. 37" 60-A132 20" 21-1/2" 141 5-9 lbs. 39" 60-A141 20" 21-1/2" 142 9-12 lbs. 39" 60-A142 20" 21-1/2" 143 12-14 lbs. 39" 60-A143 22" 23-1/2" 151 6-10 lbs. 41" 60-A151 22" 23-1/2" 152 10-12 lbs. 41" 60-A152 22" 23-1/2" 153 12-15 lbs. 41" 60-A153 24" 25-1/2" 161 6-10 lbs. 43" 60-A161 24" 25-1/2" 162 10-14 lbs. 43" 60-A162 24" 25-1/2" 163 14-18 lbs. 43" 60-A163 26" 27-1/2" 171 6-10 lbs. 45" 60-A171 26" 27-1/2" 172 10-14 lbs. 45" 60-A172 26" 27-1/2" 173 14-18 lbs. 45" 60-A173 28" 29-1/2" 181 7-12 lbs. 47" 60-A181 28" 29-1/2" 182 12-16 lbs. 47" 60-A182 28" 29-1/2" 183 16-20 lbs. 47" 60-A183 30" 31-1/2" 191 7-12 lbs. 49" 60-A191 30" 31-1/2" 192 12-16 lbs. 49" 60-A192 30" 31-1/2" 193 16-20 lbs. 49" 60-A193 32" 33-1/2" 201 8-14 lbs. 51" 60-A201 32" 33-1/2" 202 14-18 lbs. 51" 60-A202 32" 33-1/2" 203 18-22 lbs. 51" 60-A203 34" 35-1/2" 211 8-14 lbs. 53" 60-A211 34" 35-1/2" 212 14-18 lbs. 53" 60-A212 34" 35-1/2" 213 18-22 lbs. 53" 60-A213 36" 37-1/2" 221 8-15 lbs. 53" 60-A221 36" 37-1/2" 222 15-20 lbs. 55" 60-A222 36" 37-1/2" 223 20-24 lbs. 55" 60-A223 38" 37-1/2" 231 8-15 lbs. 57" 60-A231 38" 37-1/2" 232 15-20 lbs. 57" 60-A232 38" 37-1/2" 233 20-24 lbs. 57" 60-A233 40" 37-1/2" 241 8-15 lbs. 59" 60-A241 40" 37-1/2" 242 15-20 lbs. 59" 60-A242 40" 37-1/2" 243 20-24 lbs. 59" 60-A243 42" 37-1/2" 251 8-15 lbs. 61" 60-A251 42" 37-1/2" 252 15-20 lbs. 61" 60-A252 42" 37-1/2" 253 20-24 lbs. 61" 60-A253 12" 13-1/2" 101AX 11-16 lbs. 31" 60-AX101 12" 13-1/2" 102AX 16-24 lbs. 31" 60-AX102 14" 15-1/2" 111AX 11-16 lbs. 33" 60-AX111 14" 15-1/2" 112AX 16-25 lbs. 33" 60-AX112 16" 17-1/2" 121AX 12-19 lbs. 35" 60-AX121 16" 17-1/2" 122AX 19-26 lbs. 35" 60-AX122 18" 19-1/2" 131AX 13-19 lbs. 37" 60-AX131 18" 19-1/2" 132AX 19-26 lbs. 37" 60-AX132 20" 21-1/2" 141AX 14-20 lbs. 39" 60-AX141 20" 21-1/2" 142AX 20-26 lbs. 39" 60-AX142 20" 21-1/2" 143AX 26-30 lbs. 39" 60-AX143 22" 23-1/2" 151AX 15-20 lbs. 41" 60-AX151 22" 23-1/2" 152AX 20-26 lbs. 41" 60-AX152 22" 23-1/2" 153AX 26-32 lbs. 41" 60-AX153 24" 25-1/2" 161AX 18-23 lbs. 43" 60-AX161 24" 25-1/2" 162AX 23-28 lbs. 43" 60-AX162 24" 25-1/2" 163AX 28-34 lbs. 43" 60-AX163 24" 25-1/2" 164AX 34-38 lbs. 43" 60-AX164 26" 27-1/2" 171AX 18-23 lbs. 45" 60-AX171 26" 27-1/2" 172AX 23-28 lbs. 45" 60-AX172 26" 27-1/2" 173AX 28-34 lbs. 45" 60-AX173 26" 27-1/2" 174AX 34-38 lbs. 45" 60-AX174 28" 29-1/2" 181AX 20-25 lbs. 47" 60-AX181 28" 29-1/2" 182AX 25-32 lbs. 47" 60-AX182 28" 29-1/2" 183AX 32-38 lbs. 47" 60-AX183 28" 29-1/2" 184AX 38-42 lbs. 47" 60-AX184 30" 31-1/2" 191AX 20-25 lbs. 49" 60-AX191 30" 31-1/2" 192AX 25-32 lbs. 49" 60-AX192 30" 31-1/2" 193AX 32-38 lbs. 49" 60-AX193 30" 31-1/2" 194AX 38-42 lbs. 49" 60-AX194 32" 33-1/2" 201AX 22-28 lbs. 51" 60-AX201 32" 33-1/2" 202AX 28-34 lbs. 51" 60-AX202 32" 33-1/2" 203AX 34-40 lbs. 51" 60-AX203 32" 33-1/2" 204AX 40-44 lbs. 51" 60-AX204 34" 35-1/2" 211AX 22-28 lbs. 53" 60-AX211 34" 35-1/2" 212AX 28-34 lbs. 53" 60-AX212 34" 35-1/2" 213AX 34-40 lbs. 53" 60-AX213 34" 35-1/2" 214AX 40-44 lbs. 53" 60-AX214 36" 37-1/2" 221AX 24-30 lbs. 55" 60-AX221 36" 37-1/2" 222AX 30-36 lbs. 55" 60-AX222 36" 37-1/2" 223AX 36-42 lbs. 55" 60-AX223 36" 37-1/2" 224AX 42-48 lbs. 55" 60-AX224 38" 37-1/2" 231AX 24-30 lbs. 57" 60-AX231 38" 37-1/2" 232AX 30-36 lbs. 57" 60-AX232 38" 37-1/2" 233AX 36-42 lbs. 57" 60-AX233 38" 37-1/2" 234AX 42-48 lbs. 57" 60-AX234 40" 37-1/2" 241AX 24-30 lbs. 59" 60-AX241 40" 37-1/2" 242AX 30-36 lbs. 59" 60-AX242 40" 37-1/2" 243AX 36-42 lbs. 59" 60-AX243 40" 37-1/2" 244AX 42-48 lbs. 59" 60-AX244 42" 37-1/2" 251AX 24-30 lbs. 61" 60-AX251 42" 37-1/2" 252AX 30-36 lbs. 61" 60-AX252 42" 37-1/2" 253AX 36-42 lbs. 61" 60-AX253 42" 37-1/2" 254AX 42-48 lbs. 61" 60-AX254