1.imported feed pump core,high effective of ink 2. materila of wearable tip from Japan 3.tip can be bullet &chisel . Erasable white board marker writing length 350m writing width1-2mmpackage 12/144/1728chisel or bullet fiber tip black ,blue ,red ,green ready color for choice chinese ink ,international color ,dry fast ,wipe off easily after writing get certificate of MSDS ,EN71 and ASTMD .OEM ...