Genuine Bach Stradivarius Cornet & Trumpet, & others valve stem felts, set of 3 or a dozen. P/N 30022Z, OD9/16 x ID3/16 x T1/16". Fits many, including Bach Cornet, Flugelhorn, and Marching Mellophones. Contact me if you wish to verify your model's fit or you need other parts.
