HARKEN 38mm Triple Big Bullet Block, 129 Item Type_Wedge Kits and Risers They use a combination of

They use a combination of scientifically optimized block geometry

designed especially for the racer looking for higher strength to lower weight ratios

Schaefer Stand up spring block for 1" T-Track with Delrin™ sheave ensures smooth operation and high safe working load

where deformation of ball bearings alone would result in increased friction

barber haulers

HARKEN 38mm Triple Big Bullet Block, 129 Item Type_Wedge Kits and Risers They use a combination ofLow 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. Wire Bullet blocks use roller bearings to carry higher loads and features Hard Lube anodized aluminum sheaves for strength and corrosion resistance. Mast exit blocks with cams are used for halyard controls and under boom mainsheets.