This set of 8 twin-wheel swivel casters will be the perfect accessory for small equipment and furniture like a workbench, trolley, coffee table, plant stand, bookshelf, shopping cart, etc. These casters are made of TPR (thermoplastic rubber), which is distinguished by a good shock and vibration resistance, enabling these casters to run smoothly and quietly. Additionally, their soft surfaces effectively protect your floor from scratching. Besides, the zinc-coated iron frame is highly rust-resistant and thus adds to the caster's sturdiness and durability. Additionally, Half of these swivel casters are equipped with brakes for flexible control. Each caster has a maximum loading capacity of up to 220.5 lbs. Delivery includes 4 swivel casters and 4 swivel casters with brakes.