Thank you for viewing. This is a cap accessory specifically for HydroFlask wide-mouth bottles. The drinking spout opens by twisting the top of the cap. It can be disassembled for cleaning, allowing for hygienic use. Size: Diameter: 68mm, Weight: 97g Material: Body: Polypropylene, Silicone rubber I was using another cap, so this one is unused, but please understand that it is a pre-owned item that has been in someone's possession, and thank you for your understanding. ♬