If you have a small one or something, they can be made of silicone, polyurethane, latex rubber, and various types of vinyl.
In the US they’re generally rubber or polyurethane, which is laserable.
Vinyl is not laserable, and can release a gas that will eat parts of your machine.
Polyurethane seems more prone to melting than anything else, but there are good settings for rubber (here’s a link to one):