A set of Nikon auto extension rings PK-11A, PK-12, and PK-13. Although they have been used very little, the boxes have stains and damage due to long-term storage. - Model: PK-13 - Model: PK-11A (Slightly stiff to attach and detach) - Model: PK-12 - Accessories: Instruction manual - Type: Auto extension ring Please examine the images carefully and understand that these are used items before purchasing. #nikon