This was a product I didn't have on my "In search of" list, but when I saw it for the first time it looked intriguing, so I purchased it for my child and I to discover. We have used these pieces in the play kitchen, as part of a gymnastics pretend play, on upside down wood trays balancing bauspiel lucent cubes and various little peg dolls and other wood figures. We use them for learning math, tracing circles with pencil, and anything you can imagine a circle being used for. These are one of our most used and well loved Grimm's products, and I would have never guessed that when I bought them. A wonderful surprise.
I love how these integrate with the other grimms numbers. The small rounds are easy to lose track of. But the rounds have so much open play potential.
Have been on the hunt for this item for a while. The Natural Baby Co always comes through!