Designed for Open Sauce 2025. There is space for a 34 × 1.5 mm disc for a logo or QR code. Also, space underneath for 1in NFC sticker. It's a good tolerance test as everything is designed to snap together. NFC Sticker - https://www.amazon.com/dp/B0CPJ5DDCQ?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1