Made of 100% high-quality food-grade silicone, our silicone teether features nubby textures on both sides to soothe sore gums. It can be chilled for added relief. The heart-shaped cut-out allows for attaching an optional clip. The additional stainless metal clip is rust-free and nickle-free. It opens with ease but grips on clothing or blanket tightly for optimum security. Tested regularly at a government-accredited lab to meet and exceed safety standards.