Grimm's iconic Large Rainbow has now been joined by other members of the family. The Large Pastel and Natural Tunnels also have twelve pieces, but watch out for the 10-piece Sunset Rainbow and the half-size and mini equivalents.
These pieces are cut by hand from a single piece of wood. They are often slightly imperfect in shape and may only fit together in one direction. This is perfectly normal and doesn't affect how they are used.