A staple cartridge, comprising: a cartridge body, comprising: a deck; a plurality of first staple cavities arranged along a first curve, wherein said first curve is defined by a first radius of curvature, and wherein each said first staple cavity comprises an opening in said deck; a plurality of second staple cavities arranged along a second curve, wherein said second curve is defined by a second radius of curvature, wherein said first radius of curvature is different than said second radius of curvature, and wherein each said second staple cavity comprises an opening in said deck; a plurality of staple drivers positioned within said first staple cavities and said second staple cavities, wherein each said staple driver is movable between an unfired position and a fired position; a curved longitudinal passage configured to receive a driver for lifting said staple drivers between said unfired position and said fired position; a plurality of staples positioned within said plurality of first staple cavities and said plurality of second staple cavities, wherein said staples are supported by said staple drivers, wherein each said staple comprises a base and at least one leg extending from said base, and wherein said legs of said staples are configured to extend above said deck when said staple drivers are in said unfired position; and a compressible tissue thickness compensator positioned above said deck, characterized in that said legs of said staples extend into said tissue thickness compensator when said staple drivers are in said unfired position. a cartridge body, comprising: a deck; a plurality of first staple cavities arranged along a first curve, wherein said first curve is defined by a first radius of curvature, and wherein each said first staple cavity comprises an opening in said deck; a plurality of second staple cavities arranged along a second curve, wherein said second curve is defined by a second radius of curvature, wherein said first radius of curvature is different than said second radius of curvature, and wherein each said second staple cavity comprises an opening in said deck; a plurality of staple drivers positioned within said first staple cavities and said second staple cavities, wherein each said staple driver is movable between an unfired position and a fired position; a curved longitudinal passage configured to receive a driver for lifting said staple drivers between said unfired position and said fired position; a deck; a plurality of first staple cavities arranged along a first curve, wherein said first curve is defined by a first radius of curvature, and wherein each said first staple cavity comprises an opening in said deck; a plurality of second staple cavities arranged along a second curve, wherein said second curve is defined by a second radius of curvature, wherein said first radius of curvature is different than said second radius of curvature, and wherein each said second staple cavity comprises an opening in said deck; a plurality of staple drivers positioned within said first staple cavities and said second staple cavities, wherein each said staple driver is movable between an unfired position and a fired position; a curved longitudinal passage configured to receive a driver for lifting said staple drivers between said unfired position and said fired position; a plurality of staples positioned within said plurality of first staple cavities and said plurality of second staple cavities, wherein said staples are supported by said staple drivers, wherein each said staple comprises a base and at least one leg extending from said base, and wherein said legs of said staples are configured to extend above said deck when said staple drivers are in said unfired position; and a compressible tissue thickness compensator positioned above said deck, characterized in that said legs of said staples extend into said tissue thickness compensator when said staple drivers are in said unfired position.