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"Ronstan's award-winning Series 75mm Core Blocks have a tuned two-stage bearing system that provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle dynamic or static loads.Under moderate loads, the Acetal ball bearings ensure minimum friction. Under heavy loads, stage two kicks in and the sliding Acetal bearing on a polished stainless steel race takes over to maintain low-friction performance.The Series 75 Core Blocks are ideal for mainsheet, halyard, and spinnaker sheet applications on up to 46' (14m) and general applications on larger yachts.This Core foot block has less than half the friction of its nearest competitor. This double block has a removable threaded pin at the shackle head. Its central hub hole can be used as a becket take-off point."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.apsltd.com/75mm-core-block-double-non-swivel-head.html>