Ceramic core size: 7*3.6mm Color: As Shown 100% Brand new and high quality Metal heads size: 9*8mm, Type: Fiber Optic Accessories * Fiber optic visual fault locator accessories Ceramic core and metal heads. * If the red light cannot enter the fiber, check whether the ceramic core is damaged. If yes, replace the ceramic core, you don't need to repurchase the red light pen. * The ceramic core is a fragile product, do not install brutally. * Release the metal tip, remove the ceramic core with tweezers, and gently insert the new ceramic sleeve by hand, then install the metal tip. * Standard size for most VFL, and easy to replace, easy to use, save more time and costs. Package include: 10 x Ceramic core 10 x Metal heads Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. 2. Please allow 1-3cm measuring deviation due to manual measurement.