Yamaha SB-5X-2, Silent Brass System for Trombone, Latest generation with STX-2, Consists of a smaller, lighter mute with almost natural blowing resistance and the Personal Studio, which features Yamaha's exclusive Brass Resonance Modelling Technology, Dimensions mute: 129 x 220 mm (5-1/16"" x 8-11/16""), Weight of mute: 155 g (5.5 oz.), Dimensions STX-2: 70 x 20 x 98 mm, Weight STX-2 without batteries: 69 g (2.4oz), Battery operation: 2x AA (not included), Includes headphones
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