This is fusing glass purchased for making accessories. It can also be used without any problems for stained glass making (came and copper tape techniques) that does not involve firing. The size of each glass piece is approximately 4.5cm (height) x 3.5cm (width). (There may be slight individual differences due to being sample products.) *If using for firing (fusing), cracking may occur unless the glasses have the same COE (coefficient of expansion). This set's COE has not been confirmed, so please be careful when using it for firing. This glass has a wide variety of colors and can be used for a wide range of crafts such as accessories, mosaics, and stained glass. (Moretti (Venetian glass) coefficient of expansion 104 fusing glass) *Thank you for viewing. If you are considering purchasing, please feel free to contact us.