Slipstream is clean and contemporary handcrafted glass. Besa’s easy-to-use bayonet mount secures the glass diffuser to the aluminum fitter with a “twist & lock” action. Our Cosmic glass is an ultra-modern approach in handcrafted glass. The background is painted in white on the inside, while the outer surface is etched so the pattern shows as frosted. This hand-blown glass is acid etched clear on the outside surface. The process of etching creates an un-textured, satin finish. The lit glass has a subtle yet functional design.