"Black Opalescent" Cobbles 16 Ounces Cobbles are small pieces of beautiful Stained Glass with the look and feel of polished stones. Use them in mosaics, glass collage, art journals, jewelry design and as embellishments. Their unique sizes and shapes make craft projects fun and easy to do. 	The glass pieces range in size from 1/2-inch to 1-inch. Decorate frames, ceramics, bottles, mirrors, boxes, lamp bases, tiles, vases, trays, ornaments, and more. Use a good clear drying glass glue to adhere them to most surfaces such as paper, wood, and glass.