At the heart of these new grips is the patented self-retracting spiral Python core design. The spiral-shaped inner surface of the grip is designed to literally tighten around the handlebars when the handle starts to twist.the ergonomically shaped Python handles are secured with an integrated locking sleeve and are made of triple-density polyurethane, which provides excellent support for your hands. length: 144 mm diameter: not specified by manufacturer weight: 186 gr. ergonomic shape