This Uni-Kit toner refill kit contains Black toner refill for Okidata B4545MFP, one replacement chip, accessories and easy to use instructions. This is also compatible with Okidata B4500, B4520, B4525, B4540 and other printers using 52116101 cartridge. Compatibility includes Okidata B4545MFP refill kit, Okidata 52116101