The pen is better oil: UNICORN Silicone Lubricant (PEN Type). pen ● made by German Silicone Lubricant ● Water resistance and organic solvent resistance. ● Durable 150 degrees C working temperature under atmosphere. ● H1- registered (food grade lubricant), French drinking water certificate (ACS), Halal certification (halal certification). ● Stainless steel, spring-switched nib. ● Easy to control the flow, there will be no problem of excessive extrusion. ● Pen design makes it easier for users to hold and use.