Vandoren Hygro Reed Case for Bass Clarinet ~ Tenor & Baritone Saxophone (HRC20) Type: Bass Clarinet ~ Tenor Introducing a new reed case that maintains humidity while also providing ventilation. The sponge inside the case gradually evaporates, moistening the reeds inside and preventing deformation. At the same time, the ventilation holes on the outside allow excess moisture to escape, preventing the accumulation of excess humidity inside the case. The attached humidity-measuring disc allows you to visually check the humidity by color, and if the humidity inside the case is too low (less than 40%), you can control it by moistening the sponge. It is also easy to disassemble and clean, so you can always carry your favorite reeds in a clean and best condition. Introducing a new reed case that maintains humidity while also providing ventilation. The sponge inside the case gradually evaporates, moistening the reeds inside and preventing deformation. At the same time, the ventilation holes on the outside allow excess moisture to escape, preventing the accumulation of excess humidity inside the case. The attached humidity-measuring disc allows you to visually check the humidity by color, and if the humidity inside the case is too low (less than 40%), you can control it by moistening the sponge. It is also easy to disassemble and clean, so you can always carry your favorite reeds in a clean and best condition. VANDOREN HYGRO REED-CASE BASS CL/T,B SAX Please understand that this is a used item.