These bottle stoppers are turned from various species of wood and coupled with stoppers made of stainless steel. Although the rubber ribs fit very tight when inserted into a bottle, they are not meant to be used when laying a bottle on its side.
The traditional teardrop design stopper, as used with #5 (pictured below), has an attractive look, but I have found that the snub-nose design used with #6 is handier, as it can stand upright on its own when not in use. I intend to use only the snub-nose stopper going forward, but the teardrop will be available on request.