1. Oil pen tip is made of carbon steel, which is ordinary steel and lasts longer. 2. 4pcs Oiler pens with protective cover, ultrathin, thin, medium, and large size, suitable for different watch parts for lubricate. 3. A professional tool for watchmakers and clock repairmen, compact and portable, convenient to take to any occasion. 4. smoothly between gear and parts, avoid dry wear of parts, the service life of the watch. 5. Simple and convenient to operate, watch repair accessories, give you a satisfactory experience. Usage: smoothly operation between gear and parts, avoid dry wear of parts, the service life of the watch How to Use: Before lubricating, make sure that each part, machine plate is clean, the residual dirt must be cleaned before the lubricating operation, otherwise the effect is greatly reduced. According to the amount of oil in different positions to choose the oil pen, the oil pen can not be excessive, do not use the same oil pen to dip with different oil The actual product may have slight color difference or difference, which not affect the use Colour:Photo Color Material:Metal Package Contents: 4 x Oil pen 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.