The rings aren't drastically different in circumference this makes the toy more interesting when challenging toddlers to arrange the rings by size. The shaft has the same width all the way through allowing the rings to be stacked up in any order which also makes the toy more useful as I can challenge my toddler to stack them up in ascending, descending order. The rings make great bracelets and anklets as toddlers often use them as accessories. The 'giantess' of the toy means it is played with everyday and is a step up from the classic stacking rings. The texture of each ring is great for sensory development for babies, and the top ring 'the icing on the cake' which doubles as a rattle is very entertaining for toddlers.