Blue Topaz Stained Glass MiniCobblets 2.5 oz MiniCobblets are tiny glass pebbles made of beautiful Cathedral Stained Glass with the look and feel of translucent polished pebbles. Glass for crafts such as mosaics, collage, glitter, floral crafts and scrapbooking . Their unique sizes and shapes make craft projects fun and easy to do. The glass pieces range in size from 1/8th to 3/8. MiniCobblets can be purchased in 2 oz., 8 oz., or 16 oz. Bags.