Each of these puzzles builds into a perfectly formed 3D sphere, that can either hang on your Christmas tree (as a bauble), or on the little plastic stand as a room decoration. The curved plastic pieces are numbered on the inside, so you can either assemble the pieces by matching up the picture, or just follow the numbered pieces in sequence to form a really sturdy "ball". The designs feature colourful classic Christmas imagery. Each ball measures 7cm in diameter when complete.