The SMA1604FBX-100 is a 100ft 20-channel (16) Mic and (4) XLR returns fan / box StageMASTER multipair audio snake cable. StageMASTER stage snakes are medium duty, general purpose snake options. They are perfect for permanent install and club PA system use. The StageMASTER "T" bar construction makes for an indestructible box in a compact format.