The Sharp UX 645L offers a dynamic ink delivery system for exceptional monochrome printouts. Each Compatible Sharp refill roll contains thermal pigments, which minimize smudging and blurring on final printouts. The Compatible Sharp UX-3CR Refill Rolls for your Sharp ux645l printer were designed with reliable and dependable specifications to withstand the toughest printing tasks. Excellent print quality is guaranteed with our Compatible Sharp Refill Rolls or we will refund your money within 90 days of purchase. And all of our Sharp Compatible Refill Rolls have up to a 2 year shelf-life for definitive performance and convenience.