These are the Cooling Head Gaskets for the Traxxas TRX 3.3 engines !!
0.30mm is the stock thickness head gasket, use thicker gasket for fuels with high nitro content and thinner gasket for fuels with low nitro content.
INCLUDES: One each 0.20, 0.30 and 0.40mm head gaskets.
SPECS: Inner Diameter: 0.68" (17.2mm) .. Outer Diameter: 0.90" (23mm).