1,Product sizel: Inner about 14mm,suit for mos of people finger size,also can be adjustable 2,Package Include:48pieces Thumb finger Picks 3,Material: Thumb Finger Guitar picks are made of high quality celluloid, which is the premier pick material and durable, providing you with a natural feel and a warm sound and having a very nice grip. 4,Use of Occassion:Thumb Finger Guitar picks are ideal for Acoustic Guitar, Classical guitar, Electric guitar, Bass guitar, which can meet your different guitar performance needs, all being reliabilty and sturdiness, and fitting for guitar beginners, players or professionals. 5:Better Services: If you feel dissatisfied when you received your package, please contact us in time and we will help you to solve it perfectly.