Material: Lignum Vitae, African Ebony, Macassar Ebony, Malay Ebony, Indian Chestnut, Bloodwood, Purple Heart, Coconut Palm, Mimosa, Ironwood, Pale Moon Ebony, Cobras Saffron, Thai Cassia, Rose Apple, Almond wood, Sugar Maple, Burma Padauk & Thai Sindora. Instrument: We recommend these Guitar Picks for Electric Guitar and Acoustic Guitar. Tone: The 18 Timbers are arranged inside the wallet in hardness order. The harder woods will slightly brighten your guitar tone and the softest timbers will slightly mellow the sound of your guitar. Design: Timber Tones are CNC Milled from the very best quality timber, then hand sanded and hand polished to give them their amazing shine and smoothness. Timber Tones unique shape is roughly based upon the classic 351 shape, however they are 2.4mm thick where you hold them, chamfering down to 0.7mm at the playing tip. The Leather Wallet is handmade in the U.K. by a leather working artisan. It is in the shape of an Acoustic Guitar body and opens to reveal 18 slots perfectly sized to take our Timber Tones Guitar Picks. We have laser engraved the words 'Merry Christmas' onto the front. Notes: Although we have tried to ensure that our photos represent the Guitar Picks that you will receive, there is a high level of variety in our picks due to the nature of many of our natural materials.