Professional Quality L+R Guzheng Finger Picks with two Grooves, Gu Zheng Nails Size 2.8cm Professional Quality guzheng picks with two grooves. (Sound of China Item #A04-5) 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 2.8cm length for the fingers and 2.9cm for the thumb