Harken Bullet Cheek Block works well for control lines. Accepts up to 5/16 in. line and a 2000 lb load. Low-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. Wire Bullet blocks use roller bearings to carry higher loads and feature Hardkote-anodized Teflon impregnated aluminum sheaves for strength and corrosion resistance.