Ronstan Series 30 Ball Bearing Block Single Becket Option Lashing Boat Outfitting These cables exceed UL 1426 These cables exceed UL 1426 standards and are made from the highest quality ultra flexible (Type 3 Class K) tinned copper stranding that provides maximum protection against corrosion and electrolysis while resisting fatigue due to vibration and flexing Compression Lever Latch Flush Locking Their precision design provides the optimum number of ball bearings for minimum friction while weight reduction is achieved through the use of fibre reinforced composites in the block head Beckets have been carefully designed to minimise height