Silicone bumpons for the bottom of a keyboard.
They are 36mm x 6mm. Available in 1.6mm or 3mm thick. Includes 3M adhesive on the bottom.
Sold in packs of 10.
Looking for a different material? P3D Store now sells cork versions in the same dimensions (36x6x1.5mm): https://p3dstore.com/products/laser-cut-cork-bumpons