- Set of 12 Soundman felts for trumpet or cornet piston - Includes 6 black upper felts and 6 white lower felts for complete protection - Upper felts: outer diameter 18.5 mm, inner diameter 10.3 mm, thickness 2 mm - Lower felts: outer diameter 14 mm, inner diameter 5 mm, thickness 2.5 mm - Compatible with most trumpet valves on the market - Made with durable materials that ensure a perfect fit and long service life - Facilitate maintenance and improve piston response - Easy replacement to maintain the instrument's optimal performance