I am selling this item because I no longer use it. The pistons and tuning slides move without any problems. There are no dents. Thank you. The included Silent Brass does not have batteries, so I couldn't confirm its operation. It is offered as a free gift. ☑︎Included items ・YAMAHA genuine hard case ・YAMAHA 11E4 mouthpiece ・Instruction manual ・YAMAHA Silent BRASS ST9 Pickup Mute (operation not guaranteed) ☑︎Specifications ・Key: B♭ ・Finish: Silver plated Thank you. (Added September 1st) I will include the book in the photos.