Amarine-made Boat Yacht Round Opening Portlight Porthole 10" Replacement Window Port Hole - ABS, Tempered Glass -Marine/Boat/rv Portlight Hatch, Color: White(Ring not Included) 4mm thickness tempered glass. ABS Anti-aging, Anti-ultraviolet. Casted and polished 316 stainless steel accessories. Easy "click-in" construction( ring not included ) Corrosion free synthetic fittings and durable rubber seals.