- [Fit size] : Our overflow straw caps are compatible with Stanley Cup 40 oz and 30 oz. The straw cap is also suitable for a variety of straws with an outer diameter of 10 mm.
- [Food grade material] : Stanley Cup spillplugs are made of high quality silicone, BPA-free, soft, durable, reusable, easy to clean, hand washed, dishwasher safe.
- [Practical design] : The leakproof plug can perfectly seal the straw to prevent water from overflowing from the straw, and effectively prevent debris and dust from entering the cup through the straw, it not only forms a seal, but also can fix the straw in place, suitable for children and the elderly