1. Made of safe Material and No trace No drill and keep your storage box beautiful. 2. Perfect for bookshelves, shoe bins, toy bins, underbed storage, shopping carts. 3. If the storage box has caster wheel, you will be very easy to move them when change house or doing cleaning. 4. Let the Storage Box be Moving: The casters can be pasted on the bottom of the storage box, the sorting box and the garbage can, making them move more labor-saving and convenient. 5. No trace No drill and Keep Beautiful:By using these adhesive caster, it won't damage the surface, no trace, no drill and Do not affect the beauty of the storage box. Easy to install and Use:Simply peel the film on the back, firmly press onto the smooth surface, suggest to wait for 24 hour that will be better when using. Colour: White Material: ABS Size: 4.7 x 2.4 x 1.8cm Package Contents: 4 x non-rotating casters / 16 x non-rotating casters Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.