Thank you for viewing. This is the MUTIO (trombone & flugelhorn) by MORITA Co., Ltd. It's made of red plastic. It has two overlapping sponges, which I think allows it to fit various bell shapes. It's generally clean. The inner sponge seems a little worn, but I don't think it affects use. The sponges are not originally glued, so they can be removed. As shown in the last image, you can shift the sponges to fit the bell. Please refrain from purchasing if you are sensitive to used items.