This is gouging carbon (carbon rod). Model number: 40GX DC Size: φ4.0 × 305mm It's a bag labeled as 100pcs, but it's been opened due to long-term storage, so the actual number of pieces hasn't been counted. This item is recommended for those who are not concerned about the exact number. The condition is as shown in the photos. Please understand and accept this. There is dirt and torn bags due to storage, so it will be sold at a bargain price. *Please consider this as a junk item. *We may not be able to answer specialized questions. *No returns or refunds accepted.