This is the Caffewerks 8.4mm silicone replacement group head gasket for the Rancilio Silvia, Silvia Pro, and Silvia Pro X. Silicone gaskets are known to last much longer before needing replacement, and they do not produce the odor that rubber gaskets can over time.
Product Variation Disclaimer: Please note that the manufacturers may source components from various suppliers. As a result, the part you receive may differ in color, material, or finish from the product image. These variations do not affect the fit, form, or function of the part unless explicitly stated in the product description.