Vinyl-coated dumbbells — a cast iron core dipped in coloured vinyl, with hex heads that stay where you put them. Sold in pairs, priced by size, from 1 kg to 10 kg. Every size is a different colour, so the pair you want is easy to pick out.
This is the light end of the range — toning, aerobics, rehab and classes, and the vinyl is kind to a tiled or wooden floor. If you are after something heavier, the rubber round and hex dumbbells pick up where these leave off.