Initially created as a baby toy, but enjoyed by adults as interactive sculptural objects this set of 3 hollow rings each looks the same on the outside, but when held, one rattles, one "weebles and wobbles" with an offset weight, and one has a free-moving stainless steel ball that spins around and around. All make you wonder what's inside, and how it got there. Maple with pharmaceutical grade mineral oil finish leaves a silky smooth finish and means little ones can teethe without worry.