Reusable Silicone Bottle Caps: You will receive 4 different colors of glass milk bottle caps (green, blue, beige and pink), perfect for your glass milk bottles to meet your use and replacement needs. Assured Material: These reusable milk bottle tops are made of high quality silicone, durable, safe, odorless, not easy to break and fade, easy to clean and reusable for all milk storage needs. Tight Seal: These silicone replacement lids are easy to put on and off and form a watertight seal on glass milk bottles, effectively locking in freshness, a must-have for every family that values quality food storage. Compatibility: This silicone bottle top has an inner diameter of 48mm, an outer diameter of 51mm and a thickness of 14mm. Compatible with Stanpac & Libbey & Stock Your Home & The Dairy Shoppe milk glass bottles. Easy to Clean: Our silicone lids are heat-resistant and can be used in the dishwasher, refrigerator and microwave. Enjoy the convenience and versatility of keeping your drinks fresh and fitting into your busy life.