Solid steel material, and high quality. Small engine spark plugs feature a copper core electrode that provides increased conductivity. Heat control while delivering good overall wear characteristics. Easy to replace the old one and improve the engine performance. Name:Spark Plug Material:Metal Size:14*54mm Color:Silver+White Quantity:10pcs Type: Hand Tool Parts Package Contents: 10*Lawn Mower Spark Plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.