Sorting tray, plastic, white and black, 3x3x3-inch triangle. Sold per 10-piece set.
 
These sets of tiny plastic trays are incredibly helpful in sorting beads, and visual layout of beads in combinations. They sit flat in low profile to the work surface so tipping is minimized. The triangle design allows them to be positioned closely together for color-blend planning. The unique beveled inside edge makes it easy to pour beads back into storage containers.