The Trigger is a knife kit that enables kids ages seven and up to build their very own model of a folding lock-back knife. Just like our original Nathan's Knife Kit, this is a great way for adults to teach youngsters about the function and safe handling of a folding knife with the safety concerns of a real knife. Kids have a great time building it and taking it apart again over and over. The fun gets bigger when you mix colors from two kits to make a customized knife. Trigger Knife Kit Grey Specifications: Specifications: Blade: 3.2 (80 mm) Edges: Rounded for safety Closed Length: 4.2 (106 mm) Open Length: 7.3 (185 mm) Weight: 0.8 oz (22 g) For ages seven and up.