1. daws cov teeb meem ntawm tus number case flow, ink penetration, hmoov txheej ntawm hloov zaj duab xis, thiab anti roj ntawm cov khoom tiav;
2. High colour ntom, muaj zog dawb number case zais lub zog, zoo compatibility ntawm cov xim dawb thiab xim number case;
3. Cov luam ntawv zoo nkaus li mos thiab muaj zog elasticity;
4. Tus number case yog du txaus los luam tawm ntawm qhov kub thiab txias;
5. Muab cov ntawv thov fluorescent digital luam ntawv.
