These are made from 316 stainless steel, so they're as good as it gets.
They are also wider so fill the groove on the manifold rubber perfectly.
The third picture shows a standard clip on the left, and the one for sale on the right, to show the difference in thicknesses. The forth picture shows two clips on a manifold rubber (not included)
Suitable for Lambretta or Vespa that has a rubber manifold and needs this size clips.
This is for  a pair