Expanding on the original, patented swivel pulley line by Rock Exotica, the CMC ProSwivel Pulleys are time-tested, Made in the USA, and brought to you by two companies committed to quality and service. Available in single and double sheave versions from 1.1″ radius up to 2.6″, these pulleys are an excellent option for Mechanical Advantage (MA) systems for hauling and ascending, and they work well in combination with high anchors, tripods, and redirects.