The product is made of high quality ABS material, which is strong, wear-resistant, smooth and firm. The sticky pulley is small and light and can be attached to the bottom of the object. Does not affect the overall appearance. Two-wheel design, the center of gravity is more stable, the edges are smooth, ABS roller frame, powerful weighing capacity, the sliding noise is small , silent and noise reduction. No need to drill holes, no damage to objects, old people and children can install it. Easy to install, first wipe the area where the product will be attached. Align and paste the directions of the four rollers. Let it sit quietly for 24 hours before using. All four rollers are mounted in the same orientation. Suitable for trash can, clothes case, flower pot, paint box, small heater, etc. You can save yourself the hassle of moving just by inserting the rollers. Please use within the range that can bear the weight. Install the pulley for easy handling. 8 black pulleys + 8 white pulleys, an essential family accessory. Sufficient quantity can meet your different needs. 100% Brand New and High Quality Material: ABS Plastic Color: Black + White Size: 4.5 x 2.2 x 1.5cm / 1.8 x 0.87 x 0.6inch Quantity: 16 Pieces The product is made of high quality ABS material, which is strong, wear-resistant, smooth and firm. The sticky pulley is small and light. Let the box slide easily. Two-wheel design, the center of gravity is more stable, the edges are smooth, ABS roller frame, powerful weighing capacity, the sliding noise is small, quiet and noise reducer. Furniture casters are with paste, adhere to the bottom of the object, do not affect the appearance. It is a stick type, transport rollers do not damage furniture. 8 black pulleys + 8 white pulleys, no need to drill holes, no damage to items, the elderly and children can install it. Easy to install, first wipe the area where the product will be attached. Align and paste the directions of the four rollers. Let it sit undisturbed for 24 hours before using. Scope of delivery: 8 x Pulleys black 8 x White Pulleys