A 2x2" tile for D&D. I made this as part of a large project that I am doing for my CAD class. There are holes in the center of the piece on each of the sides to place magnets. The magnets are 3x1mm. Some of the smaller magnets that I could find without custom ordering them.

Link for the magnets: https://www.amazon.com/gp/product/B075P9QH8B/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1