The "Micro Mouse" pulley is an excellent choice for saddles with a rope bridge, such as the new Weaver Cougar or the Glide II, etc. Two holes permit independent connection of your split tail or prusik, and your climbing rope. Probably lots of other uses too. Quality CMI construction with a sealed bronze bushing, aluminum side plates, fits ropes up to 13 mm. WEIGHT: 3.4 oz.