Feature:1. It has a wide range of applications and can be used to fix the bottom universal wheels of sofas, office chairs, cabinets, etc.2. The wheel caster cup uses high quality rubber materials, it has large carrying capacity, strong and durable, no peculiar smell.3. Sturdy rubber design will not harm the your floor and prevent scratches from casters, make your furniture in place firmly.4. Multiple resistance bars are designed for better fixing effect, and the depth of the grooves can better fix the universal wheel.5. Furniture will stopper casters will protect any floor surfaces from the indentation of bedroom or household furniture.Specification:Item Type: Caster Cups Material: RubberColor: BlackProduct Size: Approx.7.5x7.4x1.7cm / 3.0x2.9x0.7in(L x W x H)Deepest Grooves: Approx.1cm / 0.4inWeight: Approx. 452g / 15.9ozApplication: Can be used to fix the bottom universal wheels of sofas, office chairs, cabinets, etc. Package List:6 x Caster Cups Note:1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.