OZER Cartridges are made of high-quality plastic and medical-grade 304 stainless steel, ensuring that each cartridge needle is durable, safe and reliable. Each needle is individually sealed and sterilized with E.O. gas. Compatible with all screw-on cartridge handles and machines. OZER Cartridges feature a unique tip vent that ensures consistent ink flow. The silicone finger ledge provides ultimate comfort, while the anti-shaking system reduce vibrations. Available in more than 80 different configurations.