Package content: you will receive 4 pieces different colors of baby stand up walker tool rings, which is designed to help babies train to stand and walk, and you can put it in the crib and let the baby try to stand through using the ring Safe material: the baby crib pull ring is made of quality plastic, and the braid strap is made of nylon, durable and sturdy, will not cause the kids feel uncomfortable, not easy to deform and fray, the hook will attach well to the crib Apply ergonomic design: Baby bed stand up rings are easy to use and lightweight. Easy for baby to grasp, comfortable to hold, and wont hurt baby hands. Through grasping the pull rings, baby exercises his thinking and walking ability. Very practical for your babys preliminary learning standing Convenient to use:It is easy to use, lightweight, and can be carried with you when you are out or traveling.The crib ring is detachable and does not require installation tools A range of applications: the crib rings' hooks can be hung on the edge of cribs, bassinet or pram travel bed, helping baby walk and stand, they are portable so that you can carry them around; Please note that they should be installed on fences less than 2.3 cm/ 0.9 inches thick