This is the Dubro Treaded Lightweight 5" Diameter Wheel.
FEATURES: TL Series Foam Interior yet has a Tough and Rugged Exterior Skin 8-Spoked Gray Plastic Wheel Shock Absorbing 3/16" (5mm) Axle Diameter and Can be Drilled to 1/4" (6mm) maximum
SPECS: Tire Diameter: 5.5" (127mm) Tire Width: 1.5" (38mm)
INCLUDES: One Tread Lite 5.5" Wheel
COMMENTS: Writing on tire "DU-BRO" and "5.00 T.L. (127mm)"