Are you looking for spill-proof mug lids? The water mug lid is designed for preventing liquid from sloshing out of the cup. It is made of silicone and plastic material, high temperature resistant, And the cup lid is in simple shape, very charming and , add more color to the simple cup cover. Features -Color:Black -Material:Plastic, silicone -Size:10.00X10.00X1.00cm/3.93X3.93X0.39in(30oz cup lids) -Size:8.70X8.70X1.00cm/3.42X3.42X0.39in(20oz cup lids) -Note: Suitable for 20/30 oz mug - Stable and practical, these water bottle caps have , excellent and useful, universal and reliable for home use. - Wide application, these water bottle caps are multi-functional and practical, perfect and suitable for water bottle, drinking bottles. - These water bottle caps have good sealing effect to that the water will not splashing, leak or spill. - Made of selected plastic material, these water bottle caps are healthy, excellent and , lasting service life. - Simple and modern design, easy to tighten, very practical and convenient for sport water bottles use. Package list: 1 x mug lid(for 20oz cup) 1 x mug lid(for 30oz cup)