Set of three, Vivitar (made in Japan), macro lenses. These are 52 mm thread mount #'s 1,2 and 4 optical glass in metal cells that fit all standard SLR lenses. Best results obtained with 50mm SLR, OM1 or equivalent. Yields up to +7 diopters in combination for beautiful images. I have used these on wild-flowers, small insects, etc., with fabulous results.
Optical glass is scratch free multi-coated and excellent.
Comes with black felt-lined, leatherette case, box and instructions.
Thanks for looking.