Description If you are looking for a Belly Bottle Cap Spill Proof Plug with reliable material, I will tell you that our spill proof stoppers will be your choice. It adopts plastic material, so you can keep it for longtime. You can use thesespill proof stoppers with confidence, very useful and leakproof. Features -Color:White -Material:Plastic -Size:2.80X2.80X0.50cm/1.10X1.10X0.20in -Inner diameter: 8mm - Specifically designed to fitting belly cup, ensuring a perfect and seamless match between the water bottle. - Plastic material, belly cup cap spill proof plugs are wear resistance, lightweight, and longer service life. - Suitable thickness, lightweight, exquisite appearance, spill proof plugs can be installed easily and quickly. - Enough quantity. The spill proof plug is enough for you to use and replace in your daily life, widely used. - Thespill proof plugwill be a good helper soon when you need to take advantage of them for long time. Package List2 x bottle spill proof stoppers