1. The design of enlarged wheels makes the center of gravity more stable,does not shake when pushing,and the force is even and more stable,the silent wheels are stable and quiet,will not scratch the ground 2. The storage box wheels are attached to the bottom of the object, which does not affect the overall appearance.When 4 wheels are used at the same time, the load-bearing capacity can reach 8KG,strong and wear-resistant,long- term use 3. Just tear off the film on the back, and then firmly stick the sticky casters on a smooth surface.and suggest to wait for 24 hours that will be better when using 4. The storage box caster wheels can be used for trash cans,storage boxes, shoe boxes,toy storage boxes,etc. box can be easily moved, allowing you to move easily when cleaning. Size: 1.9 x 1 x 0.78 inches Colour: blue + pink Material: ABS Package Contents: 1 set x caster wheels Only the above package content, other products are not included. Note: Light reflection 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.