Beckman Original Hook-Free Treated Replacement Net Bag Super strong, bonded, commercial nylon seine material, the kind used by large commercial fisherman. The specially woven edge at the top of the bag is a 300 pound-test bonded nylon - strong enough to hold any fish that fits in the net. Beckmanet bags stay open for maximum netting area instead of trailing behind or fouling on the hoop as lighter materials do The metal closures or "buttons" on the bag side and the brass ring in the bottom serve as optimum fasteners and keep the net bag from floating, especially in current.