Birchwood Casey Tactical Tac-Match Set Prefilled Nylon. It has perfect shooting height with plenty of clearance for 30-round mags. The bags are constructed of extremely heavy-duty ballistic nylon. Its rear bag is designed to go two different ways to hold a variety of firearms. Specifications for Birchwood Casey Tactical Tac-Match Set: Manufacturer: Birchwood Casey Fabric/Material: Nylon Size: One Size Package Contents: Birchwood Casey BC-SRB-CMBO Tactical Tac-Mac Set Combo Prefilled Nylon Birchwood Casey BC-SRB-CMBO: Tactical Tac-Match Set Prefilled Nylon