This is an "EFR" quality made CO2 laser tube with a life span for up to 6000 hours!
Specification
Courtesy reminder: Any damage that happens on the shipment; the buyer must report to us within 3 business days after receiving it. If failed to do so; this will result in rejection on all claims. Customers must file a report to the carrier and keep all shipping materials handy for inspection. The buyer is responsible for the shipping cost of a replacement tube if 30 days or after receiving.