I bought this as I had read somewhere that it was good for teething. The wood is treated and is safe for children to put in their mouths.
It is simple but is made well. The wood on the main ring feels so soft, the coloured ones have a lovely sheen to them but do feel slightly less soft than the main ring - not that this is a problem, just describing it.
Probably not the best item to buy as a rattle, although the wooden rings will obviously bash together and make noise I think there are more interesting rattle noises out there with a more interesting design. It has the ring shapes and fixed ball shape to feel but again there are better toys out there for exploring / feeling.
Although my daughter chews on her other toys it is only briefly, whereas she keeps this for much longer and has started to favour it (she has not had it long). Really happy with this for teething and bonus extra shapes for her to feel and play with.