Product Description Material:The self-adhesive wheels are made of high-quality ABS and 304 stainless steel, it is different from the traditional pulley, it is self-contained, and the round conjoined shape frosted thick material makes the pulley more durable, sturdy and stable. Package Contain:Built-in 360 degree swivel steel pulley wheel x8 Warm tips: The mini caster wheels come with two holes, you can choose to tighten them with screws or paste it with stickers. (Tips: The package without screws, if you need it, please prepare by yourself) Easy to use: Just stick the sticker on the pulley and stick the pulley on the item you need, then you can gently push the item. Let the pulley stand for 24 hours for better results Widely Used: The universal caster wheel can be used for storage boxes, trash cans, flower pots, and other items, turning your heavy boxes into a car.