This is the Dubro #400TL Treaded Lightweight 4" (102mm) Diameter Wheel.
FEATURES: TL series foam interior yet has a tough and rugged exterior skin 8-spoked grey plastic wheel Shock absorbing 3/16" (5mm) axle diameter and can be drilled to 1/4" (6mm)
SPECS: Tire diameter: 4"(102mm) Tire width: 1.15"(29mm)
INCLUDES: One 4" Wheel
COMMENTS: Writing on tire "DU-BRO" and "4.00 T.L. (102mm)"