Description Designed for moving freely, allowing you to move storage box and furniture smoothly. Made of premium material for long time and durable use. It has a simple design, but very practical in use, giving you a good using experience. Also can be a good gift choice for your friends, they will like it. Features -Material:plastic, steel - Just stick the roller underneath storage box, easy to pull out when needed. - Ball and bracket integrated design, sturdier and not easy to fall apart. - It is suitable for storage box, trash can, cabinet, flower pot, and etc. - The ball pulley design makes it quieter when pushing without scratching the ground. - Special design and it is in fine craftsmanship. It is the best replacement for your old, broken one. Package list: 8 x caster wheels