The QUANTUM STORAGE SYSTEMS Swivel Stem Caster Kit includes four wheels measuring 5" x 1-1/4" that feature a grey and chrome exterior color. The model number for this set is QUANTUM WR-00H, and each wheel weighs 4536 grams. The swivel stem caster kit is designed for use in material handling and caster wheel applications, offering durability and functionality for a variety of industrial and commercial purposes.