These are 3" Super Lite Wheels from Dubro.

Features

Black impact-absorbing foam construction pre-mounted on
gray plastic 7 spoke rims.
Rib tread design.

Includes

Two 3" Super Lite Pre-mounted Wheels

Requires

Wheel collars to hold them on the axle.
May require reaming out the hole to mount on larger axle.

Specifications

Diameter: 3" OD
Diameter: .178" axle hole
Weight: 13.84 gr