30 and 20 Ounce (Approximately 50.6 ml) 2-Piece Replacement Lids for Car Cups - Inner Diameter 3.2inch (Approximately 8.1cm) - Spill-Proof Lid, Sliding Lid, Reusable, Splash-Proof Mug Lid. Note: Note: Note... the Lid Is Only Suitable for the Two Sizes of Inner Diameter 3.2inch and 3.74inch for the Cups