Learning Resources Giant Magnetic Number Bonds, 55 Pieces Giant magnetic number bonds allow students and teachers to engage with Fact families and part-part-whole relationships as a Group Can be used as a demonstration and hands-on activity tool to support academic standards Set includes 3 circle and 3 square number bonds, 4 connecting lines, and 45 magnetic counters. Bonds measure 8 in Diameter or 9 square. Counters measure 1 in Diameter.