The metal straw conducts heat very well. In summer you can enjoy a cold and smooth sip from your cool beverages. Silicone tips would be suggested when you use it for hot drinks.
The silicone parts can be cut by scissors into different lengths to fit different size tumblers.
Clean the straw after use and sterilize regularly. Not cleaning it soon after each use can make it hard to wash and can be unhealthy if reusing it when not clean.
Adult supervision is required when used by children under 12 years old.