Schlipf practice mute for tuba, model Nr. 4, lightweight, only about 1kg, fits for: Melton Spezial 45 Qh-L, 45 SLP, 45 SLZ, 46S, 45S, 2011FA Heritage Howard Johnson Gravity, 18, B&S 5099, 5100, 4097 C, Miraphone M7000, Besson 983 Eb, Rudi Meinl F 5/4, Rudi Meinl C 3/4