360 Rotation The mini casters can slide 360, they are completely silent when in use and cause no damage to the floor and the rotation pulleys can be shockproof. High Quality Material The casters are made of strong ABS material and small stainless steel balls, they are both strong and durable which can bear a maximum load of 8 kg. Practical These mini casters are suitable for trash cans, storage boxes and shoe boxes, etc. The smooth swivel casters help you move heavy boxes easily. Installation Method You just need to peel off the film on the back of the casters, then press firmly on the smooth surface. It is better to use 4 stainless steel adhesive casters to stick on the 4 corners of the bottom of the box. After sticking them, you are recommended to use them after 24 hours. Package The package of this product includes 4 360rotation casters and each casters is equipped with 1 adhesive sticker. You just need to stick the rotation pulleys to the bottom of the box without needing to plant holes. This wheel is 0.55 inch high, it can help the computer dissipate heat well after using it on your laptop and extend the life of the computer. Increase the utilization of your desktop space, you can place your files, mobile phones and some small items in the bottom space of the computer. Raise the computer to protect your wrist, relieves the pain of your wrist when you use the computer for a long time. mini self-adhesive casters 1. Clean and dry the bottom of the box. 2. Peel off the film from the double-sided dot. 3. Use 4 mini rollers to stick on the 4 corners of the box. 4. Please leave it for 24 hours before use.