This pen uses 13mm triple-lead cap threads, for a great user experience. Each pen is one of a kind and has been turned, sanded, and polished by me. Alumilite resin will produce a different pattern each time which makes every pen unique to any owner.These pens are great gifts to give as a promotion, graduation, thank you, for a retirement, or just everyday use for yourself. I hope this pen brings joy to the owner for years to come. Each pen comes in a gift box. Thank you for your consideration. Color: madame butterfly, by blanksbybbc. Pen dimensions all measurements are given in inches and should serve as a general guide only. Every pen is made by hand so no two pens will be exactly the same. Closed length: 6 1/8th inches. This item is made of theeatenapple and eatenapple, eatenapplecrafts, alumilite, potter, dolphin cove, dolphin.