An end effector, comprising: a first jaw comprising a plurality of staple-forming pockets, wherein the plurality of staple-forming pockets comprises a first pair of pockets; and a second jaw comprising a staple cartridge, wherein the first jaw and the second jaw are movable between an open configuration and a closed configuration, and wherein the staple cartridge comprises: a cartridge body, wherein a plurality of staple cavities are defined into the cartridge body, and wherein the plurality of staple cavities comprises a first cavity; and a first staple removably positioned in the first cavity, wherein the first staple comprises: a base comprising a first end and a second end; a first leg extending from the first end; and a second leg extending from the second end; and a first driver, wherein the first staple is positioned intermediate the first driver and the first pair of pockets, wherein the first driver is configured to move the first staple into forming engagement with the first pair of pockets to deform the first staple from an unformed configuration to a formed configuration when the first jaw and the second jaw are in the closed configuration, wherein the first staple comprises a first height at the first end and a second height at the second end when in the formed configuration, and wherein the first height is different than the second height, characterised in that the first driver comprises a stepped pushing surface. a first jaw comprising a plurality of staple-forming pockets, wherein the plurality of staple-forming pockets comprises a first pair of pockets; and a second jaw comprising a staple cartridge, wherein the first jaw and the second jaw are movable between an open configuration and a closed configuration, and wherein the staple cartridge comprises: a cartridge body, wherein a plurality of staple cavities are defined into the cartridge body, and wherein the plurality of staple cavities comprises a first cavity; and a first staple removably positioned in the first cavity, wherein the first staple comprises: a base comprising a first end and a second end; a first leg extending from the first end; and a second leg extending from the second end; and a first driver, wherein the first staple is positioned intermediate the first driver and the first pair of pockets, wherein the first driver is configured to move the first staple into forming engagement with the first pair of pockets to deform the first staple from an unformed configuration to a formed configuration when the first jaw and the second jaw are in the closed configuration, wherein the first staple comprises a first height at the first end and a second height at the second end when in the formed configuration, and wherein the first height is different than the second height, characterised in that the first driver comprises a stepped pushing surface. a cartridge body, wherein a plurality of staple cavities are defined into the cartridge body, and wherein the plurality of staple cavities comprises a first cavity; and a first staple removably positioned in the first cavity, wherein the first staple comprises: a base comprising a first end and a second end; a first leg extending from the first end; and a second leg extending from the second end; and a base comprising a first end and a second end; a first leg extending from the first end; and a second leg extending from the second end; and a first driver, wherein the first staple is positioned intermediate the first driver and the first pair of pockets, wherein the first driver is configured to move the first staple into forming engagement with the first pair of pockets to deform the first staple from an unformed configuration to a formed configuration when the first jaw and the second jaw are in the closed configuration, wherein the first staple comprises a first height at the first end and a second height at the second end when in the formed configuration, and wherein the first height is different than the second height, characterised in that the first driver comprises a stepped pushing surface.