Each textured letter offers a flexible and bumpy surface, perfect for new teeth getting ready to start chewing foods. This stage 2 teether covered with knobs adds just the right amount of sensory input to the teething experience, making it ideal for practicing biting and chewing skills. Teething on the Knobby letter allows Baby's mouth to remain open for breathing and sound play! Knobby letters are free of latex, lead, BPA, PVC and phthalates. Knobby letters are approximately 3" in diameter and 1/2" thick. 6-24 months.