It is here to save $400.00 per printer! Some mechanical skills required to install. Developed for Oki C5000 series printers, and extensively tested on many actual C5100, 5150, 5200, 5300, 5400 C3200 series printers This listing is for one kit, you will install in any color drum unit: Yellow, Magenta, Cyan or Black. It is 100% compatible with any drum cartridge in your Okidata C5100, C5150, C5200, C5300, C5400, C3200 printer. Please note: pictured drum not included - reset kit only for drum as on picture! Sorry we can't display this part on picture! Spend 5 minutes and get 25%-100% more life out of used drum you already have ! Free tech support by e-mail ! These kits easy to install in just 5 minutes each - no special tools required, illustrated instructions included. Please note: used drum you have must be in good working condition prior message "order drum" or "replace drum" appeared. Kit to repair worn or damaged drum is also available: please e-mail to inquire. Fast 2-3 day shipping is $5.95 for the first item and $2.00 each additional. What feedback my buyers posted? "WOW this product works!! I'll keep buying from thiser!!!" Worked BETTER than expected!! Will definitely use again! Thanks A+++ I Thank You for saving me so much money, Will return! Thanks! I'll be buying more in the future. Thanks for reading!