Description:1. Material: The roller frame is made of high quality ABS and stainless steel. The wheel frame is sturdy and durable. The wheel is wear-resistant and smooth. It works more stable and safe under load.2. 360° Rotation: These 360° swivel wheels can be attached to the bottom of the storage compartment, allowing you to enjoy 360 degrees of movement, so you can maneuver the space for your pantyhose, gives you more flexibility in your workspace.3. Easy to use: Simply attach the seamless adhesive to the pulleys and leave them on the bottom of the box for 24 hours before use. Smooth pulleys make heavy loads less troublesome.4. Infinitely durable: These spare wheels allow you to roll smoothly without noise and ensure they don't scratch or leave marks on any surface.5. Scope of application: the wheels can be used for many different applications, such as storage containers, containers, general box, boards, etc. They are suitable for all kinds of storage containers. Specifications:Color: Black/White Material: Stainless Steel + ABS Package Includes:4 * Universal Pulley Note:1. Please allow 1-3cm differs due to manual measurement.2. Due to the different display and different light, the picture may not show the actual color of the item. Thank you for your understanding.