Wooden 100-bead abacus using red and yellow beads - Colors: Red and Yellow - Material: Wood - Design: 100-bead abacus - Number of beads: 20 total (10 red, 10 yellow) I'm selling this because I no longer use it. I'm also including two sets of larger 10-bead abacuses. You can use them as 10-bead abacuses, or you can attach them together with the magnets to make a 20-bead abacus!! I'm not considering selling them separately. m(_ _)m