Sakura-Microperm Pen. Permanent on most surfaces! Experience a water and fade resistant ink. This package contains one 05 black pen. Conforms to ASTM D 4236. Imported

The Blue Bottle Tree review... "Sakura Microperm and PITT Artist Marker both have excellent performance on polymer clay. They both hold up to water and alcohol and neither bleeds when coated with Varathane. Microperm markers can be a bit pale and PITT is probably better if you want a dark line."

Read the whole review at The Blue Bottle Tree