These are the Cooling Head Gaskets for the Traxxas TRX 2.5 & 2.5R 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.
Copper construction .. Three different thickness allow you to taylor your compression.
INCLUDES: One each of the following thickness of gaskets: 0.15", 0.25" & 0.35".
SPECS: Outside diameter: 0.834" (21mm) .. Inside diameter: 0.590" (15mm).