4M Training Gear Endurance Stroker from Topco Sales. Train your way to a longer, stronger performance with the 4M Endurance Stroker. Equipped with an extra tight, unique interior texture, made for intense stroke sessions. Soft, flexible body safe material for a strong finish. Removable sleeve makes cleanup fast and easy! Simply add 4M Endurance Water Based Lube and start training! For best results, use with the complete 4M Performance Training Gear Collection. Size dimensions width 2.5 inches, height 6.1 inches, depth 2.5 inches. Weight 0.7 pound.