Albion PA wheels are made of a polyurethane elastomer that is open-cast on clean, close-tolerance die cast aluminum cores. The polyurethane tread to chemically bonded to the core. This high-capacity polyurethane protects floors, is non-marking, and delivers a more quiet operation thans tandard metal wheels.
PD0410108 is a 4-inch mold-on polyurethane wheel with aluminum core and roller bearing.
For similar wheels, but with a standard cast aluminum core, please explore the PA wheel series.