Our 19 month old son loves thesis color pencils / crayons! He got them for Christmas and has been using them everyday since. I've bought 4 additional packs to give away as gifts. They are thick and very easy Hence for his little hands to hold and control. They produce a lovely rich color and Thick Line Which my son finds very satisfying. And best of all for mum, it washes off ever so Easily with just water. A friend's daughter drew on our woodblock floor and I just wiped it off with a cloth. It washes off clothes on a regular wash cycle in the machine. On our white laminate Ikea furniture it takes a bit of scrubbing but it comes off. It's only difficult to get off untreated light colored wood (like pine). A month of use later, I've finally had to sharpen them for him and the sharpener is easy to use and effective. We absolutely LOVE this product!