This is a Gear Diff O-Ring Set for the HPI Sprint. FEATURES Black rubber construction. INCLUDES Two large o-rings. Four small o-rings. REQUIREMENTS Assembly on vehicle. Remainder of differential components. SPECIFICATIONS 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") COMMENTS These are the differential seals.