This is a lens holder made by GoWing. It allows you to attach lenses on both sides. This product enables quick lens changes. It's for Canon EF-S/EF mount lenses. This listing does not include a strap. Please refer to the third image for an example of use. Lenses are not included. New ones are sold at Yodobashi for 11,880 yen. (As of February 15, 2025) Thank you for viewing.