Package includes: You'll receive 4 baby stand-up walker tool rings in different colors, designed to help babies practice standing and walking. Attach them to the crib to encourage your baby to stand. Safe materials: These crib pull rings are made of quality plastic, and the braided strap is made of nylon, making them durable and sturdy. They're comfortable for babies, won't easily deform or fray, and the hook attaches securely to the crib. Ergonomic design: These baby crib stand-up rings are easy to use and lightweight. They're easy for babies to grip, comfortable to hold, and won't hurt their hands. By gripping the pull handles, babies exercise their thinking and walking abilities. Very practical for your baby's early learning to stand. Convenient to use: It's easy to use, lightweight, and can be carried with you when you're out or traveling. The crib ring is detachable and requires no installation tools. A wide range of applications: The crib ring hooks can be hung on the edge of cribs, strollers, or travel cots, helping babies walk and stand. They're portable so you can take them with you. Please note that they should be installed on fences that are less than 2.3 cm/0.9 inches thick.