Teethe and learn flashcards are designed to grow with baby! Each is safety certified with soft silicone teether discs that soothe teething pain. Teether promotes learning, encourages sensory play and is built for on-the-go! 5 flashcards per set. 3" in diameter. Teether for 4 months +, learning fun for 18" months +. Dishwasher safe.