You receive 40 fineliner 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 needs for crafting. 2-1/32 inches long, with an outer diameter of 7mm, the brass pen tube can fit your fineliner pen well; the standard size ensures compatibility with many fineliner pen accessories, providing versatility and convenience; whether you are making pens for commercial use or pencils for art projects, these tubes help you get good results. The fineliner 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 , but also ensures resistance and damage, providing a solid element without adding too much weight. This fineliner pen kit only includes 40 Brass , you need to prepare other accessories by yourself, such as 7mm drill bit, fine wire bushing, pen core shaft and or acrylic blank Color: Gold Material: Copper Package Contents: 1set x pen making supplies 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.