These Premium Black 3:1 twin loop binding spines from Renz are some of the best on the market. Renz premium black 3:1 ring wire spines are conveniently packed on special plastic trays to prevent the spines from getting bent or tangled. These black 3:1 spines are sometimes referred to as Wire-O, Twin Loop Wire, Wire Combs, or Double Loop Wire. They allow pages to lie flat with 360 degree rotation for convenient note-taking and photocopying. Made from the highest quality raw materials, Renz premium black 3:1 ring wire provides a permanent bind to your documents--giving you the peace of mind that comes from knowing your presentations always look great and stay secure. These Black 3:1 Renz Premium Ring Wire are designed for use with your Wire Binding Machine and Wire Closer . Check out the full line of Premium Renz Ring Wire spines today.