The AIN Stein Leads 0.9mm are designed to provide a superior writing experience with enhanced strength, smoothness, and darkness. Thanks to their advanced ceramic cell structure, these leads are approximately 10% stronger than other refill leads, reducing breakage and ensuring smoother lines. Ideal for use in mechanical pencils, these leads are supplied in a convenient swivel-top tube for easy dispensing. Whether you're writing, drawing, or drafting, AIN Stein Leads offer consistent quality and performance.