This is the stock plug for Tomos A55 mopeds. The threading on this plug is longer, so that it can reach the full length of the head. Morini mopeds also require a long reach plug. If you have performance modifications, you might want to try a colder plug.
When it comes to spark plugs, NGK is the World Leader. Makers of spark plugs for virtually every automotive, motorcycle, marine and small engine application, NGK dominates.
NGK Spark Plugs (USA), Inc. was established in 1966 as a subsidiary of NGK Spark Plug Co, Ltd., of Japan. Its purpose was to establish and develop a market in the United States for NGK spark plugs and NTK ceramic products.