The wooden sorting box contains 10 different compartments with 10 slots. There are 3 Header Strips: one with numbers in correct sequences on one side and domino patterns on reverse side, one with numbers and one side domino patterns in out-of-sequence order (for more difficult problem-solving) and one with 10, graded colors on each side. Set includes 50 wooden tiles with objects to count and 20 wooden color tiles.