Review on Discover the Game-Changing Broadfix Revolutionary Flat Shims (1, 60)! by Dustin Ferguson

Easy to use. The specs didn't say so, but they're nominally 4" x 1-1/8" in size, with various thicknesses promised. To save on plastic(?) they are not solid but have ribs molded in to effectively be "tight" seals. The only main reason is that I wanted to use them for something other than gaskets and they are less stiff than if they were solid plastic. (This does not detract from their good quality as gaskets! They are strong enough to "squeeze" the gasket.