Check the listing for details. ProLine Archery From 1990's Bow Modules Change Draw Length D,E 50% Let Off. Color: Black, Condition: New other (see details). Listed at 24.95 USD. New (old stock) Very Hard to Find!! ProLine Archery of Michigan Bow MODULES D and E From Mid 1990's Modules will decrease or increase draw length by 1" Example: If your ProLine Bow has an 'A' module, and you need a longer draw, then you need the 'B' module. (will increase draw by 1") 'C' module (will increase another inch for a total of 2"). If you need a shorter draw do the opposite to decrease length. These fit most ProLine Cams and are interchangeable from: A to E Modules (have 50% let off) AR to ER Modules (have 60% let off) - soon to be listed AM to EM Modules (have 65% let off) - soon to be listed No bow press is required to change these modules, just an allen wrench. Just a memo: Increasing draw length will increase the poundage. Decreasing draw length will decrease the poundage. ≈}}}}-----> ARCHERY