Super Easy Drum, Transfer Belt and Fuser Reset Solution for OKI OKIDATA MPS3537, MPS4242, MPS3537MC, MPS4242MC MCF MCFX (1x Drum Reset Chip) Quick, Easy, Safe & Huge Saving reset solution. Just Peel off & Stick. No opening / No Hacking required. Please read description before buying. Takes only 1-2 min. Comes with a full instruction manual. Home & Office friendly. No drum opening means no messy toner powder leaking during the job and Less chance to break sensitive drum parts which can easily happen during Drum opening. Youtube video link : https://www.youtube.com/watch?v=3OeFRU5iyGQ Why change if they are not worn out? Save your time, money and earth by reusing the parts with our simple reset solutions. Usually the Drum unit is physically strong enough to work for one or two more cycle of its stated life span.