The Slice Safety Cutter Ring slides easily onto your finger for continuous use while opening a variety of packaging materials, such as plastic bags, clamshell plastic and packing tape. With a removable silicone adapter ring, this ring knife fits most hand sizes. Its micro-ceramic blade is finger friendly and lasts 11 times longer than metal blades. And, because this cutter moves with your hand, it helps reduce the chance of repetitive strain injuries. The Safety Cutter Ring offers precise, continuous cutting power that moves with you for superior control and comfort.