Thank you for viewing my listing. These appear to be keys for shoe lockers. Numbered 1-30 in sequence, with two keys for No. 23. They are made of aluminum and measure 3.5cm in height and 2.0cm in width. They were kept as spare keys, and while they haven't been used extensively, some keys have minor scratches and show signs of use. I couldn't find any similar items for sale, and a set of 30 keys in sequence is considered rare. Please refrain from purchasing if you are concerned about minor scratches or dirt. No claims or returns accepted. *The selling price has been set considering the lack of similar items. Price adjustments can be made through comments.*