Yamaha SB-7X-2, Silent Brass System for Trumpet, 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 of mute: 82 x 139 mm (3-1/4"" x 5-1/2""), Weight of mute: 70 g (2.5 oz.), Dimensions STX-2: 70 x 20 x 98 mm (2.5 oz.), Weight STX-2 without batteries: 69 g (2.4oz), Battery operation: 2x AA (not included), Includes headphones
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