This is a used SIGMA APO TELE CONVERTER 2x EX DG, with a Canon EF mount. This teleconverter attaches between the lens and the camera, doubling the focal length. I no longer have a use for it as I sold my lens, and it has been stored in a dry cabinet. The body is the smooth type, not the rough "shark skin" texture seen on older Sigma lenses. All original accessories are included: box, case, front and rear caps, instruction manual, warranty card, and warranty sticker. There are some scratches on the mount from use. Please refrain from purchasing if you are looking for a new or mint condition item, as this is a used item. Please read the profile for information regarding transactions before purchasing. Thank you.