to pivot about the axis b defined by the pivot pin in the embodiment depicted in fig2 a 2c a leading edge 210 a of the lever portion 210 is not sharp operation of the depicted blade system 200 is described below again in conjunction with fig2 a 2c fig2 a depicts the blade system 200 in the closed position in the closed position the inner edges 212 a of each blade 206 are located proximate and substantially parallel to the axis a of the body 214 within the slots 222 the retention member 216 is located within the notches 218 so as to hold the leading tips 220 of the blades 206 in the closed position during aiming release flight and initial penetration of the arrow into the target the blade system 200 is in the closed position initial penetration of the arrow begins with penetration of the arrowhead 204 into the hide of a target animal as the arrowhead 204 travels further into the hide the sharp outer edges 212 b of the blades 206 cut the hide and outer muscles of the animal this is a particular advantage over other expanding broadheads that do not have exposed outer.