Can rings for use on 10cm or 8.25cm diameter cans. I took measure from Aldi dog food cans and designed the rings with a clip to hold onto the can seal-edge. The sharp edge that is leftover from the can lid is covered with the 10cm ring, so that you can grab into the can without danger of cutting yourself. A cover is part of the set that fits exactly inside the cover ring. The lid can be used without the ring on the 10cm can.