This is an OXO egg separator. [From the manufacturer's description] Easily separates egg yolks and whites. This egg separator can be hooked onto the rim of a bowl to cleanly separate yolks and whites. You can crack the egg on the edge of the separator. It can be securely hooked on regardless of the shape of the bowl's rim, and the non-slip grip on the main body can also catch any shell fragments. Size: 10 x 7.5 x 4cm Weight: 26g Materials: Main body - Polypropylene, Thermoplastic elastomer I've only used it a few times. There is some cloudiness as shown in the third photo. Please understand that this item has been stored at home for a long time.