Package included: You will receive 20pcs water bottle caps with an inner diameter of 28 mm, enough for your daily replacement High-quality materials: The water bottle cap is made of high-quality PE material, which is not easy to break or deform and can be reused Advantages: The cap design has a push-pull function, which can seal the water bottle well and prevent water from overflowing Easy to use: The bottle cap is simple and convenient to use, push down to close, push up to open, so that you can drink water freely during exercise Application: Bottle caps have a variety of uses to replace sports drink bottle caps and bring more convenience to your life