It is a rattle dumbbell. Buff Baby turns Junior into a benchpressing body builder. Your little ones curiosity will be piqued by the gentle rattle sound and natural hand grips, while your sense of irony will be satisfied by watching Junior do 3 sets of 10. So, work it, baby. 5.5 inches x 2 inches, no phthalates, no BPA, safe for baby. Clear giftbox packaging.