A Grease Pencil For Glass Writing is also referred to as a glass marker or wax pencil, is a specialized writing tool specifically designed for writing or marking on glass surfaces. Its composition allows for effortless writing on non-porous surfaces, making it perfect for temporary or semi-permanent labeling and notations as it is highly resistant to water. In a laboratory setting, a grease pencil can be used for glassware markings, glass slides notations, glass instrument calibration, etc. *pack of 10