Kleeblatt Stanley Anti-Leakage Plug Set Contents - 2 straw lids - 2 square anti-leakage plugs - 2 round anti-leakage plugs Key benefits - Prevents leaks and stains: protects clothing, tables, and cars from beverage spills. - All-round leak prevention: straw head cover blocks dust and spills; square plug seals and fixes the straw; round plug installed inside the lid enhances overall seal. - Keeps straw clean: designed to prevent dust and debris from entering the straw area. - Reliable, high-quality material: made from food-grade silicone for a premium drinking experience; avoids the degradation associated with low-quality 3D printed plastic plugs. Compatibility and fit - Perfect fit for Stanley Cup 1.0 models (40 oz / 30 oz). - Also suitable for Stanley H2.0 cups, but the lid cannot be turned. Please note this before purchasing. How it works - Installed in the straw hole of the lid, the set forms a seal and fixes the straw in place. - The straw head cover provides dust and spill protection. - The square plug creates a seal and fixes the straw; the round plug is placed inside the lid to improve the overall seal. Material and quality - Food-grade silicone from Kleeblatt. - Durable and safe for everyday use. - Avoids the durability issues associated with lower-quality plastics. Usage guidance - Simply insert the anti-overflow plug into the lid as directed to reduce spills and leaks when pouring. Practical applications - Office or home use: prevents spills when sipping, refilling, or carrying your Stanley Cup on a desk or in a bag. - Car or travel: minimizes leaks and stains on clothing, seats, and surfaces during transit. - Outdoor activities or workouts: keeps the straw clean and the cup sealed during activities and outdoor adventures. Note - This set is designed for Stanley Cup 1.0 40 oz / 30 oz and Stanley H2.0 cups with the caveat that H2.0 lids cannot be turned. Check compatibility before purchasing.