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 control line applications. Free-rolling Delrin ball bearings, sheave and side plates UV-stabilized with carbon-black additive 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 has a high safe working load and is designed for spar-mounted halyards and control lines. The 141 is also ideal for control lines.