Description de chez Thomann : Yamaha SB-7X-2 Pink, newest Silent Brass system for trumpet, consists of a small, slight mute with almost natural resistance provided and the Personal Studio STX-2, which features Yamaha's exclusive Brass Resonance Modeling Technology, dimensions: 82 x 139mm (3-1/4" x 5-1/2"), weight: 70g (2.5 oz.), STX-2 dimensions: 70 x 20 x 98mm, weight without batteries (2x AA): 69g (2.4oz)