ISC Wales Medium Double Prussik Pulley. Bushings are ideal for high loads at low speeds and Roller Bearings are ideal for low loads at high speeds. Pulleys in the new Prussik range have fully load-rated Beckets which are large enough to allow a Karabiner to rotate fully. Specifications for ISC Double Prusik Pulley: Manufacturer: ISC Wales Color: Red Fabric/Material: Aluminium Weight: 17.6 oz Features: Compatible with rope diameter (mm)max 13mm (1/2") Wheel material: Aluminium Finish: Anodised Weight (grams)500 Weight (ounces)17.6 Approved Standards: CE EN12278 Notes: Individual Serial Numbered Package Contents: ISC Medium Double Prusik Pulley The ISC Medium Double Prusik Pulley is a quality addition to the ISC Wales lineup. For more great deals on Pulleys & Ascenders by ISC Wales please browse our ISC Big Wall & Protection page.