Extra-long and thicker, easy-to-grab glass pins and can be used for thick tissue such as wool, knitting and denim. Pins are 0.78 mm thick and measure 49 mm long. They are arranged in a simple metal box with sliding lid, so you always know where your pins are. The head of the pins is made of heat resistant glass. 40 pins. Longer: 49 mm. Dimer: 0.78 mm. Upperquality. Glass Head Pins metal.