The product is a set of 4 Bosch 7501 WR7DC copper spark plugs, suitable for various motorcycle brands such as Kawasaki, BMW, Yamaha, Volvo, and Moto Guzzi. These spark plugs have a thread diameter of 14mm, standard configuration, and a voltage of 12V. They are Germany-made and have a hex size of 13/16 inches. Additionally, Bosch spark plugs are known for their quality and reliability, making this set a good option for motorcycle maintenance and performance. Representative item set is shown. Vintage new old stock spark plugs with original packaging, which may have a musty odor from storage. Set weight 9 oz. M14 x 1.25 thread, 19mm thread length, hex size 13/16." Made in Germany. No returns on installed items or partial sets. Please review our business policies in our store for information regarding returns, shipping and warranties. Most items have 30-day returns along with free fast shipping in 1 business day (see details). Message us anytime. Buy from a trusted 16+ year seller!