For those who have refilled before and just need INK! Our 60ml bulk ink packs save you even more money. The Uni-Kit 60ml bottles feature DuraFirm Technology Ink which has archival qualities (does not fade) is smudge resistant and waterproof on Durafirm waterproof paper! These inks are the latest technology and 100% guaranteed to perform as good or better than your original manufacturer's ink!