1、Superior Material: This trumpet valve cap is made of superior metal material which is sturdy and wear resistant ideal for long term use. 2、Easy to Carry: The trumpet valve cap is small in size so you can carry it around whenever you need it so you can change it in time. 3、Convenient Storage: The trumpet valve cap is very easy to store so you don t have to worry about the trumpet valve finger button taking up space. 4、Improve Accuracy of Keys: This trumpet valve cap helps to improve the accuracy of the keys improve the smoothness of the playing and make the sound made by the person using the instrument more beautiful. 5、Applicable Scenarios: This trumpet valve cap is used to replace old broken and missing buttons so if you happen to have a need for this then this is for you.