Knock On Wood, 1 x Keyring £2.50 . 1 x "Knock On Wood" Keyring. Perfect gift for friends, family members, loved ones, etc. Made from Oak Veneered MDF only. Each keyring measures approximately 5cm in diameter. The message will be engraved on only one side of the keyring, the other side will be blank. With the Oak Veneered MDF keyrings, please keep in mind that wood is a natural product so no two pieces will have the same finish and may differ from the image slightly. The keyring will be sent out in a small plastic bag within a board backed envelope for protection.