Children sort, count, pattern, graph and compare--with large skill-building trays that are perfect for use with our Math Counters! Children just place the counters right into the trays to explore concepts hands on�and easily keep the pieces in place as they work! Complete set includes all 5 sturdy plastic trays shown(math counters not included); trays measures 10 3/4" x 14 1/4". Each tray also available separately. Lakeshore Hands-On Math Trays - Complete Set