This is a jig to prevent the tips of skis from overlapping, helping children master the snowplow (wedge) technique. My child was able to ski right away using this. It's an older type, so the width of the part that inserts the skis is about 5.5cm. Therefore, it cannot be used with skis that have wider tips. Please be aware of this when purchasing. Please understand that this is a used item that has been stored. There are two available. If you purchase both, I will discount the shipping cost, so please let me know.