Thank you for viewing. I fired glass for stained glass (Bullseye) in an electric kiln. The size is around 10mm. Please use them as handmade parts! You are welcome to sell accessories made with these items. I create them at home. I inspect them, but small dust and debris may sometimes get mixed in. Please refrain from purchasing if you are sensitive to such things. Also, as I sort them by hand, occasionally nuggets of different sizes may be mixed in. Some nuggets may have release agent remaining on the back, or have black spots from firing. Please check the images for size and color. *As this is a glass product, it may break if dropped or subjected to strong impact. Please understand the nature of glass and purchase at your own risk. Please check the images for size and color. Feel free to ask any questions! Thank you.