This is a silicone cover used to protect the bottom of a water bottle and prevent scratches. Image 2 shows that there were originally two covers in a pack. I used one and kept this one unused. Image 3 shows the cover is unused and unopened. Both are 6.5cm in size and dark blue in color. They tend to tear with use, so having replacements is convenient. Shipping will be via Yu-Yu Mercari. Thank you.