SI Manufacturing Ten-Frame Sets helps students develop a number sense within the context of ten! Students use counters in a two-by-five configuration to visualize relationships of numbers to ten and build a knowledge base of baSI Manufacturingc math facts. Each board measures 6-1/2 in x 3 in. Product comes with 40 (10 for each board) counters. Each counter is 2-color (Red and Blue).