See-Saws have always been fun, and ours have been designed to offer years of sensible use.  The main beam is 3m (118") long and 9cm x 9cm (3.6") square, pivoting on a single ash bearing 38 mm (1.5") in diameter.  Hidden within the support base is a steel bolt running from one side to the other, providing for a strong pivot support structure.  The two shaped seats are made from a waterproof material similar to bakelite, whilst the two handles (38mm (1.5") are large enough to give a feeling of security and comfort when holding on.