You will receive 20 pen tubes, the quantity is enough to meet your needs and replacements, you can also share some with your friends or family, which can meet your various needs for crafting. 2-132 inches long, with an outer diameter of 7mm, the brass pen tube can fit your pen well; the standard size ensures compatibility with many pen accessories, providing versatility and convenience; whether you are making pens for commercial use or pencils for art projects, these tubes will help you get good results. The pen tubes are made of brass material, which has a smooth appearance and no burrs, ensuring durability and lifespan; the brass material not only provides a smooth surface, but also ensures corrosion resistance and damage, providing a solid element without adding too much weight. Each package contains a total of 20 7mm pen tubes; this quantity is enough to make 10 double-tube pens or pencils, which means you can make multiple projects without worrying about insufficient materials; with this package, you can not only guarantee the quality, but also the quantity is guaranteed. This pen kit only includes 20 Brass barrel, you need to prepare other accessories by yourself, such as 7mm drill bit, fine wire bushing, pen core shaft and a wood or acrylic blank. You can combine the fine-line pen holder with other pen sets to create a beautiful pen for holidays, birthdays, anniversaries, and can also be given as gifts to family, lovers, friends and colleagues. High-quality brass tube, no need to worry about quality issues. A few spots on the surface are normal. Size:Approx. 2-132 inches long, 7 mm outer diameter Note:May contain small items, please keep them away from small children. Colour:As Shown Material:copper Package Contents: 1set pen making supplies(The pen on the side is an effect drawing, not included, only accessories) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is - 1-3cm.