Metal wheels on these four matching casters with metal rollers or wheels. Iron stem casters perfect for furniture or small cart. One side of the caster is marked Universal 5. There is some residue on these that scrapes off with your fingernail so I believe they will clean up if so desired.
The caster measures 3 1/4 inches long overall, the stem is 1 1/2" long. The end of the 1/4" stem has a 5/16 bulb diameter. The casters are 1 1/4 " diameter by 5/8" wide wheel. The wheels roll freely.