If you can use screwdriver - you'll save over $100.00 on each cartridge ! Attention - this is not a toner refill, This is bottle with 190 g developer, Toner cartridge isn't included! Please read below: This is a 190g developer in a bottle to make your copier to print crisp again. High quality individually factory sealed bottle with toner and illustrated guide for replacing the old developer in AL-100TD toner cartridge.This developer works with Xerox WorkCentre XD100, XD102, XD103f, XD105f, XD120f, XD125f, XD130DF, XD155DF, Sharp XL-2120/2130/2140f, AL-1530, AL-1540, AL-1541cs, AL-1551cs, AL1641cs, AL-1651cs, AL-1655cs, AL-1661cs copier/printers. This developer provide superior print quality and easy to install in 15 minutes with Philips screwdriver. It will last for at least 6,000 copies with 5% coverage (we use it in our rental machines for many years). Illustrated guide is included. Thanks for reading! What feedback buyers of this product posted? Happy Sharp AL-1541 owner, awesome experience! I saved $150 in 15 minutes!! "WOW this product works!! I'll keep buying from thiser!!!" Worked BETTER than expected!! Will definitely use again! Thanks A+++ A++++ Most Trusted E-Bayer!!!! Fast-Lightning Shipping! I Thank You for saving me so much money, Will return! Thanks! I'll be buying more in the future. Thanks for reading!