... and North American ,middle east etc.professional QC to control the quality, and technological department research new product and renew ... on voice, card, long durable time, never jam the nozzle.Stable performance, excellent color reducibility, trouble free for variety and succession printing ... kept timelessly 6) Safe and non-poisonous, harmless to human 7) 100ml, 500ml, 1L, 20L ink packages available.