Tortoise Shell has been the "Holy Grail" of guitar picks for as long as I can remember...and, for a considerably shorter time than that [we won't get picky] we have been trying to make picks which are legal and non-lethal to life forms, and which get the same sound. John's wonderful Studio Picks taught people that a pick could be redesigned...and has 3 different picking points,each of which gets a different sound! So, after using Casein [a resin made from Milk and Phosphoric Acid] for our Faux Tortoise Shell Pins, it wasn't much of a stretch of the imagination to think about doing the Studio Picks in Casein. Our NEW John Pearse® FAST TURTLES are so named in honor of all the tortoises who got away safely! They are available in 3 different gauges of Thin [1.2mm], MEDIUM [2.5mm with Dimple] and Extra Heavy [4mm with Dimple]. They also come with a complimentary cloth pouch so that they won't get left in your pockets and go through the washing machine.