Set of 2 P's & Q's are fun new exercisers for practicing biting and chewing skills! P's & Q's are made of the same FDA compliant material as Chewy Tubes and offer a safe, non-toxic durable surface for biting and chewing activities. They are latex-free and do not contain PVC or phthalates. P's and Q's are solid rather than tubular so they offer a firmer surface for biting than the red or yellow Chewy Tubes.