You are looking at replacement ski tips for Polvere, Ripido, and Volare skis. If you crashed into a tree in the dark, you may have broken your ski tips. These plastic dodads will make you whole. Sold as a set for a single ski.
Please note there are two skin attachment styles. The older EVO skins slid in from the side, underneath the overhanging tab. The new Attivo skins feature a metal tab that bends over the tip of the ski between the two protectors.