The Protection Racket Series of Bass Drum Bags are a semi-rigid bag that are made with 600 denier polyester and a dual-density foam that is hard on the outside and soft on the inside. They also feature a fleece interior that repeals moisture and will even clean and polish your drums in transit. The rigid handles are also lined with soft neoprene for carrying comfort. The zippers are a heavy-duty nylon spiral chain that is indestructible plus water and rot proof. The stitching thread that holds it all together is bonded nylon that will not deteriorate.