Jerify Knobby Balls Bouncy Spiky Sensory Ball Bulk Soft Inflatable Massage Stres Jerify Knobby Balls Bouncy Spiky Sensory Ball Bulk Soft Inflatable Massage Stress Plastic Toy for School Party Play Indoor Outdoor. Manufacturer Jerify. Included Components 500 x Balls. Size 4.72″. We do not accept P.O. Boxes.