Hollow Tube Design compresses to provide optimal teething relief Lil' Tots are easy to hold, bend & flex & is long enough to reach back molars. Value Pack includes 4 Sensory Teether Tubes. Safety & Washing: All Senso Minds Products are made FDA Compliant, Food Grade Silicone, FREE of BPA, Phthalates & Petroleum Based Plastics Lil' Tots Teether Tubes are Dishwasher Safe and can be cleaned via Warm Water & Soap!