This is an item of stationery (paper or writing goods), or other small merchandise such as good-luck charms, mascot straps, et cetera.
HIjikata helps himself to a big bowl of tasty mayonnaise! This colorful rubber keychain mascot is about 7.2cm by 3cm, and is attached to a silvery metal keyring--he can keep track of your keys, or be attached to your purse strap, backpack, rear-view mirror, or just about anything!