Introducing the Phelps PDO Diaphragm Call Organizer, a great way to organize and dry your calls out between using them. The PDO will hold 8 diaphragms total, 4 on each side. 550 paracord lanyard. FeaturesHolds up to 8 diaphragm calls (4 on each side)Lanyard constructed with 550 paracordKeeps calls organized and allows them to dry