Thank you for viewing. I purchased this item, but it was too heavy for me, so I am selling it. Since it is not new, please assess the condition of the product from the photos. Also, please note that I am not considering selling individual items. Features an adjustable Velcro strap. There are no problems with its use. I think it can be used not only for simple training but also as a weight for divers and free divers. Since shipping is included, I will use simple packaging. I plan to ship via Yu-Yu Mercari. If you have any other requests, please comment before purchasing. I will not be able to change the settings after purchase if you say things like "I want you to do ◯◯," and the price may change depending on the request and effort required. If there is no demand, I will dispose of it. *Please refrain from purchasing if you are sensitive to items stored at home.