These are mini Sierra Cups that were released as limited editions at the Yukimi Festival. This is a set of four: Spring 2019, Autumn 2020, Autumn 2021, and Spring 2022. They have only been used a few times, and none of them have been used very often, but they do have a used feel as they were carried around. Please check my profile before making an inquiry or purchase. Uses/Purpose: Camping, Picnics Material: Stainless Steel