Brand Bosch Core material Platinum Top material type Ceramic, Metal, Nickel Vehicle service type Motorcycle The information below applies to each unit in the pack Bosch premium spark plug: manufactured in Europe from one of the leading global automotive suppliers First-class spark plug technology: based on original equipment and engineered to the specific requirements of the engine Plugs easy to replace: factory-pre-set electrode gap, no adjustment necessary; Bosch advices not to lubricate the thread. Requested tightening torque or angle see on package High wear resistance: precious metal alloy at the center electrode High Robustness: special ceramic material with high dielectric and mechanical strength; high gas tightness due to hot shrink assembly Corrosion