Unfortunately, the material is much harder and less flexible compared to those from IKEA. As a result, it tears more easily and, in my opinion, is less suitable for its intended use.
The silicone lids have a total diameter of 10cm, measured from the outermost edges. This does not refer to the area for sealing the can. A typical 800g food can has a diameter of 10cm, and these definitely won't fit over it. The lids are designed for 400g cans.