Low friction Bullet Blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all controll line applications. Delrin ball bearings, sheave, and sideplates are UV-stabilized with carbon black for maximum protection. Wire Bullet blocks use roller bearings to carry higher loads and feature Hardkote-anodized Teflon? impregnated aluminum sheaves for strength and corrosion resistance. Mast exit blocks with cams used for halyard controls and under boom mainsheets. The 140 is designed for under-boom mainsheets or for spar-mounted halyards and control lines and pivots for a fair lead. The 141 is ideal for control lines.