●Compatible with Pilot FriXion refill specially designed. The unique thermo-sensitive ink disappears completely with erasing. Whether working in the office tackling note-taking, editing, or for schoolwork completing like class notes, articles, and writing practice, it can provide you with an excellent writing experience, BUT not suitable to USE THIS PEN TO SIGN CONTRACT or ANY OTHER IMPORTANT PAPER. ●Made of solid aircraft grade aluminum alloy 6061 with stainless steel pen clip, T6 heat treated for heavy-duty force with superior strength; this pen is rugged and unbreakable, but still, the overall weight is balanced for long writing and easy to operate any tools on this pen; hard anodized as per ASTM B580-79 for durable performance at daily use after CNC machining and well buffed on all edges. Fine machined threads are a guarantee of long lifetime use. ●Super smooth bolt action (PRE-GLUED, BUT PLEASE ADD SOME THREAD GLUE TO THE THREAD OF BOLT IF IT START LOSING) design for retracting refill to avoid the mess-up your pocket, notebook or backpack by gel ink; also, the bolt action is a great fidget gadget when you are stressed at design or daily work, the bolt action function will help you to reduce stress, stay on your task. ●Stylish engraved lines on the barrel are to reduce potential slip and make the pen easier to hold for a long time writing; this pen is extremely lightweight, yet unbreakable and durable for many years. The erasable refill is making this pen ideal for calligraphy, meeting memo, design sketch, temporary test data, ordering dishes, and so on use by students, office staff, designers, testers, and waiters. ●Search on Amazon for more of our pens like CNC machined pens, tact pens, titanium pens, brass pens, carbon fiber pens, fountain pens, and other unique pens. Our designers are outdoor pros and tact experts and our products are designed based on actual demands and needs; also, we hear voices from our customers every day and provide solutions for their concerns from time to time; your opinion is super important to us!