This fine cover is designed to give extra protection to your cello bow in the case. It does not need a locking mechanism and does not have a long buttonhole, as most cello cases do not have a rotating holder, as is usual for violin cases. For violin bows, there are two models, one with a buttonhole and one without. The models without buttonhole are for other storage methods such as extra bow tubes, where sometimes several bows are packed together. Here, separation with a delicate cover is recommended.