Simple solution to save your seed without additional "writing" letters. In the first grid, you have the letters of the alphabet marked and the possibility to mark the first 4 letters of your word with an automatic pen (4 letters are always enough to store the whole word, they are subsequently added automatically in the HW wallet), i.e. 12 words on one side and the other make a total of 24 words to restore your seed on the Trezor or Ledger HW wallet.