Tri-Chews were designed with ridges, bumps, and swirls on each end to simulate the various textures of food. Jaw movement and pressure can be experienced through the varied sizes of the ends, which are also small enough to prevent gagging. The textured sides provide sensory input for the lips, gums, and tongue. The soft material may provide comfort and calm a teething baby. The triangular shape makes it easy for little ones to hold. Not recommended for aggressive chewing. The Tri-Chew XT is the same as the Tri-Chew, except that it is made with the tougher, Grabber XT material. The Combo Pack comes with one Tri-Chew and one Tri-Chew XT. Material and color are FDA compliant and contain no latex.