2-Color Desktop AbacusDesktop model features a frame that is thicker than the beads, which allows abacus to lie flat on student desks. Abacus activities offer students tactile counting practice and visual reinforcement of math facts. Includes 10 rows of 10 beads in 2 colors grouped in 5s for ease of use. Abacus measures 81/2"L x 1/2"W x 91/2"H. Grades K+