The Zoliduo bead is a two holed glass bead and shaped like a comma. It has a flat surface on one side and a curved surface on the other, which is why the bead comes in a left and right version. The point of the bead will either be pointing to the right or to the left. When working with a pattern which uses Zoliduos it is important to determine up front how much beads you need of both versions.
A bag of Zoliduos contains approximately 25 beads.