Designed to fit into the bottle neck of all of our Bike Cleaner and Drivetrain Cleaner bottles for easy refilling Perfect for refilling our Bottle For Life Collapsible fold up design makes it portable and easy to store Flexible construction Easy to clean and dishwasher safe Made from durable, food-grade silicone that’s non-toxic Silicone is highly durable and more ocean friendly than plastic Collapsible design means lower CO2 footprint in shipping compared to a regular plastic funnel