I used this when my child was small, for riding a bicycle or skateboard. They've grown up now, and it's been sitting in the shoe cabinet. I was thinking of throwing it away, but it still seems usable, so I'm listing it. In terms of size, it's probably suitable for elementary school children up to around the middle grades. The item placed on the right side in the third photo is a 30cm ruler. It's a used item, so I'm hoping to cover the shipping costs and maybe a little extra. Thank you very much. m(_ _)m