Fred Kelly Bumblebee Extra Heavy Left Handed Teardrop Picks (2 picks). The Bumblebee, is a unique combination of a flatpick and thumb pick, all rolled into one! It is fully adjustable and rotational, which makes it user-friendly and adaptable to your individual playing style. This pick is made of delrin material. Delrin is an extremely strong, unbreakable material, and provides a very soft and natural sound on the strings.