Micnova KK-C68 Pro Auto Focus Macro Extension Tube Set for Canon EOS EF & EF-S Mount 5D2 5D3 6D 650D 750D Film Cameras (12mm 20mm and 36mm Tubes) Kit of three extension tube sections: 12mm and 20mm, 36mm - Any combination of tubes can be used for various reproduction ratios Designed with all the electrical and mechanical couplings to maintain auto focus and TTL auto exposure Extension tubes are designed to enable a lens to focus closer than its normal set minimum focusing distance Made of brass, Metal and plastic Construction 1 Year Warranty For close-up photography 3 tubes to vary magnification For use with Canon EF &amp; EF-S SLR cameras Use individually or in Combination B<span class="a-text-bold">rass, metal and plastic </span>construction Lens mount index Front and rear caps prevent the dust 1* Micnova KK-C68 Extension Tube Set 1* Portable Bag 1* Manual Book Manufactory Original Package Box