Outwater's Samson Series, Durable Twin Wheel Caster features durable, black Nylon 6 wheels and hoods, which glide smoothly on hardwood and carpeted floors. The 2” twin wheels allow for more surface area in contact with the floor and move in opposite directions to minimize carpet fiber twisting. The hooded Nylon 6 composite wheels houses the inner caster and further assures that it will never scuff or damage your carpets, hardwood or laminated floors, unlike rubber or plastic wheels, which can leave unsightly black track marks. The gusset-reinforced wheels with steel axle technology are superior to any other wheel on the market. The 16 gussets (8 on each side) inside the wheel lend to the caster's further rigidity, and allows them to support up to 75 lbs. per caster (Dynamic rating: 49lbs/wheel, 196lbs/set of 4, Static Rating : 75lbs/wheel, 300bs/set of 4) and assures that your wheels will not warp or crack under pressure. Easily installed into office and other commercial and residential furniture; Outwater's Samson Twin caster wheels with pre-drilled U-Clip can be attached with screws and a screwdriver, making it an easy DIY project doable in minutes. The economical and durable wheels fit perfectly with furniture that you want mobile, offering 360 degree movement. These multipurpose wheels also fit superbly under entertainment centers, ottomans and office furniture. These wheels also feature a brake which when activated assures that your furniture will not roll. Samson Series Wheels with brake or without brake are excellent for mix and match for your projects.