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LECAI Printer Head: 1. The materials and processing technics are entirely in line with the industry standard. The casings are made of PC imported form Japan, not ABS.(The cost of PC is four times as ABS)2. The products are manufactured and managed by ISO9001 Advanced Total Quality Management, which have sales traceability. Every cartridge has its own SN(series number).3. The products have longer lives, which can print at least 4000ml ink only if there is no jam with the nozzles.4. The products are designed by special filter traps, which will print with ink more fluently.5. The products have the unique valuable metal nozzles which can compare favorably with the original cartridges. 6. The specially designed slica gel caps bring you many conveniences when replacing the cartridges. And every with a cartridge tube.7. There are specific instructions on the packages, which can help you using suitably.8. The vacuum packing is convenient for preserving and transportation, no ageing and becoming moldy over a long period of time.9. With the completely transparent casing, it is much easier to check the ink height and more convenient to be used.10.The products are made according to the specially designed parameter of Homemade Nova Jet 750.Ensure that 100% can be used for the printers, and 100% are compatible. No air leak, no ink leak.