This tire is a Mitas XT-434 80/100-21 Motorcycle Tire. It has been the Mitas workhorse for years. This has been our most consistent seller throughout the years and works as both a play and competition tire. A strong casing and good studding pattern makes this tire WORK. A great all-arounder. These studs have a mushroom shaped base, steel body and carbide tipped protrusion. At our warehouse we drill the holes, we inject bonding glue and then use a unique machine to insert each stud. This same process is used in Europe. It is very time consuming. Beware of the imitations! This studding pattern is the PRO model - 250 STUDS.