COMETIC head gaskets for OPEL Ascona, Kadett 2.0L Those head gaskets are made of 3 layers of stainless steel. The elastomer outer layer increases oil and heat resistance (up to 250°C!). Multiple thicknesses available. Ideal for use with aluminium or cast iron. Their unique composition is perfectly resistant to shearing no need to tighten the head gaskets. Characteristics : bore : 97 thickness : 1.52 mm