A staple cartridge (5500, 6500, 7500, 8500) for use with a surgical stapling instrument including an anvil, wherein said staple cartridge (5500, 6500, 7500, 8500) comprises: a cartridge body, comprising: a proximal end; a distal end; a deck extending between said proximal end and said distal end; and a staple cavity, comprising: a proximal end wall; a distal end wall; and an opening defined in said deck; a sled movable from a proximal position to a distal position during a firing stroke; and a staple (5540, 6540, 7540, 8540) positioned in said staple cavity, wherein said staple (5540, 6540, 7540, 8540) is movable by said sled from an unfired position and out of said opening to a fired position during said firing stroke, wherein said staple (5540, 6540, 7540, 8540) is deformed against the anvil of the surgical stapling instrument when said staple (5540, 6540, 7540, 8540) is moved into said fired position, and wherein said staple comprises: a base (5541, 6541, 7541, 8541); a first leg (5542, 6542, 6542, 8542) extending from a first end of said base (5541, 6541, 7541, 8541); and a second leg (5544, 6544, 6544, 8544) extending from a second end of said base (5541, 6541, 7541, 8541); characterized in that: said cartridge body further comprises: a first cam extending over a portion of said opening; and a second cam extending over a portion of said opening; said first leg (5542, 6542, 6542, 8542) is configured to contact said first cam when said staple (5540, 6540, 7540, 8540) is moved into said fired position; and said second leg (5544, 6544, 6544, 8544) is configured to contact said second cam when said staple (5540, 6540, 7540, 8540) is moved into said fired position. a cartridge body, comprising: a proximal end; a distal end; a deck extending between said proximal end and said distal end; and a staple cavity, comprising: a proximal end wall; a distal end wall; and an opening defined in said deck; a proximal end; a distal end; a deck extending between said proximal end and said distal end; and a staple cavity, comprising: a proximal end wall; a distal end wall; and an opening defined in said deck; a proximal end wall; a distal end wall; and an opening defined in said deck; a sled movable from a proximal position to a distal position during a firing stroke; and a staple (5540, 6540, 7540, 8540) positioned in said staple cavity, wherein said staple (5540, 6540, 7540, 8540) is movable by said sled from an unfired position and out of said opening to a fired position during said firing stroke, wherein said staple (5540, 6540, 7540, 8540) is deformed against the anvil of the surgical stapling instrument when said staple (5540, 6540, 7540, 8540) is moved into said fired position, and wherein said staple comprises: a base (5541, 6541, 7541, 8541); a first leg (5542, 6542, 6542, 8542) extending from a first end of said base (5541, 6541, 7541, 8541); and a second leg (5544, 6544, 6544, 8544) extending from a second end of said base (5541, 6541, 7541, 8541); a base (5541, 6541, 7541, 8541); a first leg (5542, 6542, 6542, 8542) extending from a first end of said base (5541, 6541, 7541, 8541); and a second leg (5544, 6544, 6544, 8544) extending from a second end of said base (5541, 6541, 7541, 8541); characterized in that: said cartridge body further comprises: a first cam extending over a portion of said opening; and a second cam extending over a portion of said opening; said first leg (5542, 6542, 6542, 8542) is configured to contact said first cam when said staple (5540, 6540, 7540, 8540) is moved into said fired position; and said second leg (5544, 6544, 6544, 8544) is configured to contact said second cam when said staple (5540, 6540, 7540, 8540) is moved into said fired position. said cartridge body further comprises: a first cam extending over a portion of said opening; and a second cam extending over a portion of said opening; a first cam extending over a portion of said opening; and a second cam extending over a portion of said opening; said first leg (5542, 6542, 6542, 8542) is configured to contact said first cam when said staple (5540, 6540, 7540, 8540) is moved into said fired position; and said second leg (5544, 6544, 6544, 8544) is configured to contact said second cam when said staple (5540, 6540, 7540, 8540) is moved into said fired position.