1. You just need paste the stainless steel universal on the bottom of , can easily move these heavy objects such as Toy Bins,Bottom Box, Trash Can, Shoex Box etc. 2. The upgraded version is made of thicker material, and there are more stainless steel sliding beads into the bottom, which is smoother than the old version when moving. 3. Tear off the film of sticker, firmly press onto the clean and smooth surface of box.It is better to install this universal to the four corners to achieve balance and better bearing capacity. Please wait for 24 hours to move sticky wheels , so stickers will be stronge 4. Suitable for small spaces, such as boxes under the bed, shoe boxes. It can also allow children to easily move their toy boxes.[Note]Ad indicates a max weight capacity of 17Lbs (8kg) 5. Suitable for dormitories, apartments, home bedrooms, kitchens, living rooms, etc. These mini caster wheels are suitable for different types of boxes. It can be applied to bookshelves, box, toy bins, trash bin, small container for smooth & easier moving. Product Name: Ball Type Adhesive Pulley Colour:White Material:ABS+stainless steel Size:4.5 x 2.8cm Package Contents: 16 x Adhesive Wheels Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.