Description: Made of high quality rubber?soft and non-friable. Suitable for 1.1-1.8mm shift cable/brake cable. O-Rings protect your frame from scratches. Donuts slide on inner brake or inner derailleur cables. Easy to fit just slide them over you're bike brake/gear cable. Specification: Material: rubber Length: approx. 10 x 10mm / 0.39 x 0.39inch Package Includes: 100 Pieces O-Rings