This is a Didjeribone. I purchased it about 10 years ago from Koizumi, a folk instrument shop in Kyoto. I've only used it once or twice, so it's practically a new instrument. The Didjeribone is a plastic didgeridoo with adjustable pitch. (Didgeridoo + Trombone = Didjeribone.) It's quite lightweight and easy to carry around. Didjeribone ■ Length: 95cm, Weight: 462g ■ Key: B to G (can be changed by sliding) ■ Material: PVC pipe, plastic ■ Includes a bag for storage and carrying ■ Made in Australia When washing, the slide part can be removed, so you can take it off and wash it with water. https://www.koizumigakki.com/?pid=31931895 New price: 23,100 yen