High Quality L+R Guzheng Finger Picks with Grooves, Gu Zheng Nails Size Large High Quality guzheng picks with grooves underneath for comfortable wearing. (Sound of China Item #A04-3) This set of picks are made of high quality celluloid! They are detail filed with smooth round edge. NO SHARP EDGE THAT MAKES SCRATCHY NOISE! Size Large at 2.9cm length for the fingers and 3.0cm for the thumb