These are silicone caps that take the place of the standard lid on a toothpaste tube. The point is in the name: they are self-closing, so the cap shuts on its own after each squeeze instead of staying open. That stops paste from seeping out, hardening around the opening, or being left to dry where it gets thrown away.
One pack contains four caps, which is enough for a shared bathroom or to use across more than one tube. They are made to be reused rather than thrown out, so when a tube runs empty a cap can move to the next one. The colors come at random, so you take whatever shades are packed and cannot pick a specific one.
Handygear lists only the basics here: silicone material and four caps in the box. There are no published cap dimensions, weight, or a list of which tube sizes they fit. If your toothpaste tube has an unusually wide or narrow neck, it is worth checking it against the cap before counting on a tight seal.
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