Now that is one “buff baby” with their rattler that doubles as a dumbbell. While mom or dad are working out, your curious baby can find a connection with their workout toy by gently rattling and hearing a gentle rattle sound. Your baby can do their own sets and work it out. Not really, but it will be lots of fun watching them play. • 5 1/2" x 2", • No phthalates, no BPA, safe for baby.