Thank you for viewing. This is a special order bird strap, custom-made for summer use or washable, and is an authentic product (from Tatsumi Gakki Co., Ltd.). It's navy blue and size M. I haven't used it much, and of course, I haven't washed it. I also have a leather strap with my name embroidered on it, so I'm selling this one because I hardly use it. I purchased it last spring. I tried to recreate the order, and it came out to be 20,020 yen for the same order. I am a 166cm, 75kg male. I mainly play alto saxophone, and I also have a soprano saxophone as a sub. If I played tenor, I would probably need a size L. The delivery time was about two months, I think. Thank you.