Tempered glass is carefully broken and saved in islands for easy use in your crash glass mosaic creations. Simply apply the glass and peel off the backing. We also include about 9 oz. of glass gems.. small pieces of tempered glass. To see what can be done with this glass check out our crash glass mosaic creations on our Etsy store. This paver stone is an example of what can be done with the glass. There is more than enough glass to cover the 12x12 stone... Price includes shipping.