Herco HE113 Flat Thumb Pick Heavy 24/Pk by Herco. $30.52. Herco Picks - Two great designs in one guitar pick... Herco's celluloid flat Thumb Picks have been designed as a combination of the traditional flat pick with a thumbpick loop. All the advantages of both Guitar Pick styles are now in one design. These Herco Thumb Picks come in a pack of 24 of assorted colors - red, blue, yellow and shell. Product page if for a heavy gauge pick pack.