Sold in sets of 6. If you want 6 spark plugs, order a quantity of 1. If you order a quantity of 6, you will receive 36 spark plugs. 

• Mixture of nickel and copper-glass seal that bonds the insulator, terminal post and center electrode together, assuring full voltage
• Chromium-nickel alloy ground electrode resists gap erosion
• Copper-core center electrode sheathed in high chromium-nickel alloy for superior heat dissipation and durability
• Longer insulator nose provides a longer path to control fouling deposits