Feature 1 Adopts high quality metal materials, lightweight, sturdy and durable 2 Can decreases the lens focal length for close-up shot and won't alter the image quality 3 3 rings/set, 13mm, 21mm, 31mm, can be used independently or in combination to get different magnification 4 Fits tightly onto cameras, copper conducts inside support auto focusing 5 Good accessory for photography lovers, a good substitution to expensive macro lenses for macro photographyFeatures: Adopts high quality metal materials, lightweight, sturdy and durable. Can decreases the lens focal length for close-up shot and won't alter the image quality. 3 rings/set, 13mm, 21mm, 31mm, can be used independently or in combination to get different magnification. Fits tightly onto cameras, copper conducts inside support auto focusing. Good accessory for photography lovers, a good substitution to expensive macro lenses for macro photography. Specification: Brand: Meike Model: MK-C-AF Color: Black Options: A(Alloy), B(Plastic) Magnification: Adjustable (13mm&21mm&31mm) Suitable for Canon EF/EF-S mount DSLR Weight: Approx. 170-196g Package List: 1 x Lens Adapter Rings Set 1 x Manual Other items are not included.