The Martin Axxon 40 SD features Tri Loc axle cap, Tri Loc roto cup, Tri Loc limb pocket, Balanced Bow Technology, Dual Sync Technology, Helix Cams with Helix Grooves and RRAD Weight distribution system. Axle to axle: 39.5?, Brace Height: 7?, Speed: 328 fps, Let Off: 65-85 percent, Draw Length: 26?-29?.