This is another guitar pick that should be part of any musician's collection. It is made of highly durable borosilicate glass and features swirls of blue and white. I encased the design in a layer of clear sparkling glass to enhance the colors. I used pure borosilicate glass to make this pick, so you can be sure that it will last long. It measures approximately 1'' x 1'', and can be used on an acoustic or electric guitar.