WE HAVE FINALLY FOUND A CONSISTENT SOURCE FOR TEMPERED GLASS. CLEAR TEMPERED GLASS SHEETS. PRE-CRACKED . WE HAVE TRIED AS MUCH AS POSSIBLE TO PRESERVE BIG "ISLANDS" WHEN BREAKING IT AND PACKAGING IT FOR SHIPPING. IF YOU WOULD PREFER SMALLER OR BIGGER "ISLANDS" PLEASE INDICATE SO IN THE COMMENT SECTION AND WE WILL DO OUR BEST TO ACCOMMODATE YOU. EACH SHEET SIZE IS 12" X 12" AND IS FILLED AS MUCH AS POSSIBLE WITH CLEAR TEMPERED GLASS WHICH IS 1/8" THICKNESS.