Key features: 70% let off module for Mathews. For TRX bows using the C3X cam. NOT SUITABLE FOR TRX 7, TRX 8 or TRX 38. Technical specifications: Module TRX 36 TRX 40 C3X-A 70% Set 30.5" 32" C3X-B 70% Set 30" 31.5" C3X-C 70% Set 29.5" 31" C3X-D 70% Set 29" 30.5" C3X-E 70% Set 28.5" 30" C3X-F 70% Set 28" 29.5" C3X-G 70% Set 27.5" 29" C3X-H 70% Set 27" 28.5" C3X-I 70% Set 26.5" 28" C3X-J 70% Set 26" 27.5" C3X-K 70% Set 25.5" 27" C3X-L 70% Set 25" 26.5" C3X-M 70% Set 24.5" 26" C3X-N 70% Set 24" 25.5"