This product has 5 different kinds of balls Massage Training Ball Surface bump can massage babys palm, practice baby’s finger strength. Stretch Hand Grasp Ball: The size is moderate and the elasticity is good, can help the baby to move the finger Mini Pinching- Slightly pinch, can make sound, can practice baby’s hearing. Ringing Bell: — — PVC material, soft and elastic,shake, will ring. Character Cognition Ball: Soft polyester material with built in bell, baby can play with simple grasp, pinch,