Pair of telescopic wire brushes that were inspired by the original Gene Krupa jazz brush. They feature smooth handles with diameter of 12.7 mm, providing a great balance for fast response, and medium wire bristles that produce a traditional jazz sound and are retractable allowing any preferred amount of spread. All Promark drumsticks are designed, engineered, and manufactured in the USA. Length with extended bristles: 313 mm. Length of handle only: 173 mm. Diameter: 12.55 mm.