These are 1-3/4 Super Lite wheels from Dubro.
Includes: Two 1-3/4 Super Lite Pre-mounted Wheels
Requires: Wheel collars to hold them on the axle and may require reaming out the hole to mount on larger axle
Diameter: 44.4mm (1.750)
Axle Diameter: 3.5mm (.141)
Width: 17mm (.671)
Weight: 4.41 grams each wheel