●Package Contents: Free car x 4, brake x 4, double-sided tape x 4, screws x 16 ●Material: The casters are made of high quality nylon and iron, and can hold up to 66.2 lbs (30 kg) / 4 pieces ●Easy to install: Suitable for replacing furniture casters for sofas, tables, cabinets, etc ●【For best effect】 You need to use double-sided tape on a smooth, flat and dry surface. Please measure the caster size you need before purchasing