Grip Tones Guitar Picks are manufactured from Vietnamese Water Buffalo Horn and Bone, which are both waste bi-products from industries such as Leather, Steak and Cheese. They are hand made to our Classic 351 shape. They are 2.5mm thick where you hold them, chamfering down to 0.7mm at the playing tip. They are then Laser Engraved on one side for a huge amount of extra Grip.