This is the Matin Macro Reflector 31cm [JU0801] This simple device is an excellent accessory for macro photography. Fitting around the lens it acts as a ring light by reflecting ambient light onto the subject reducing shadows which can make close-up photography so challenging. 31cm (12") in diameter, the reflector folds up to around 14cm (5.5") and weighs only 50grams. With a silver surface on one side and a reflective white surface on the other, the photographer can choose the lighting effect. The reflector fits over most popular lenses using the central hole (approx 7-8cm diameter or 3"). Velcro tabs are attached to help achieve a secure fit. Costing much less than a dedicated ring-flash system, this is a low cost way to improve your macro photography. ...Contact us if you need more help.