This is a Gear Diff O-Ring Set for the HPI Sprint.
Black rubber construction.
Two large o-rings.
Four small o-rings.
Assembly on vehicle.
Remainder of differential components.
Outside diameter of large o-rings: 28.0mm (1.102")
Inside diameter of large o-rings: 26.0mm (1.023")
Thickness of large o-rings: 1.0mm (.039")
Outside diameter of small o-rings: 7.0mm (.275")
Inside diameter of small o-rings: 5.0mm (.197")
Thickness of small o-rings: 1.0mm (.039")
These are the differential seals.