Tissue thickness compensator having improved visibility

A staple cartridge assembly for use with a surgical stapler, wherein said staple cartridge assembly is adapted to be used with tissue having a thickness, said staple cartridge assembly comprising:

• a cartridge body comprising a support portion, wherein said support portion comprises a plurality of staple cavities, and wherein each said staple cavity comprises an opening;
• a plurality of staples, wherein at least a portion of each said staple is removably stored within a said staple cavity, wherein each said staple is movable between an unfired position and a fired position, and wherein each said staple is deformable between an unfired configuration and a fired configuration when each said staple is moved between a said unfired position and a said fired position;
• and
• a compressible tissue thickness compensator configured to be captured within said staples, wherein said compressible tissue thickness compensator at least partially covers said staple cavity openings, and wherein said compressed tissue thickness compensator is configured to assume different compressed heights within different said staples, wherein said compressible tissue thickness compensator further includes a visualization means.