This Shires Valve are indepen for a tenor trombone the where only few made by Steve shires.the valve are excellent condition .also the rotor are 562 bore the rest are 547. This valve where made for any tenor trombone player the need it the low register use on bass trombone this are very hard to find.do the are only few the where made. the are for a tenor trombone .the work great with the dou bore slide 547/562 shires slide now the price is 2600 plus shipping paypal only USA