Thank you for viewing! This is a set of dichroic glass frit (approximately 85g). (The expansion coefficient is unknown.) Recommended for creating accessories, glass fusing, and other artwork. The size is mainly fragments of about 1 to 5 cm, and includes a variety of colors and textures as shown in the photos. The photos were taken in natural light, but the actual product may appear more vivid. We will carefully pack and ship it, so thank you for your consideration.