The SteelQR C12 is the smallest format supported. It can secure your 12 word seed as a custom compact QR-Code format supported by seedsigner. This Format will not be readable with any device other than the seedsigner. The STEELQR is a storage solution made of military grade V4A stainless steel designed as a free and open source hardware product under the GPLv3 licence. Its purpose is to secure your 12 or 24 word bitcoin backup words (mnemonic seed phrase). Your seed can be encoded as a QR-code using a SEEDSIGNER signing divice and stamped on the STEELQR with a automatic or manual center punch. 21% of all profits resulting directly from SteelQR sales will be donated to the SeedSigner development fund.