Originally manufactured specifically for the Corne-ish Zen, but were made too small. Will fit small 3x5 keyboards such as the Ferris line and its derivatives quite nicely. Photo shows a Urchin by Kyek for scale.
Has nice mesh pockets on both sides to hold the halves firmly and a divider to keep the halves from rubbing. Hard but flexible exterior made of EVA and has a clear laquer LPKB logo on one side.
Maximum internal dimensions: - 81.5mm x 129mm or - 3 3/16" x 5 1/8"
Selling these super cheap to get rid of them. Please note that these are too small for Corne keyboards.