This Pre-Owned Burke Low D Aluminum Pro Viper is in excellent condition. Burke whistles need no introduction. This Low D whistle is light in the hands, with a beautiful tone all the way from bottom D to the top. It has great intonation and you'd be hard pressed to find a better whistle. This one has a C natural thumb hole so you can use it or cover it with tape. The hole gives a true strong C natural as opposed to cross fingering. The bottom features a joint to adjust where you place your bottom hole for best coverage.