Slim body & easy to hold \”Zikeshi\”isaneraser, itsduststickstothemagnet Itcontainsferrite(ironpowder) & youcancollecttheeraserdustwithamagnet The pen caphasabuiltinneodymiummagnet Youcancollecttheeraserbystickingittothecap Thecaphasaknob,andwhenyoupulltheknobonthetrashcan,themagneticforceisturnedoffandyoucanthrowitinthetrashcanwithonetouch Withabuilt-inspring, theknobwillautomaticallyreturntoitsoriginalpositionwhenyoureleaseit Pentypeeraserhasasmalldiameterof5mm, soyoucaneraseeventhesmallestdetails.