X-out board means that the boards are not qualified in panel. The trace may damage or some unavoidable issues during the production. Normally we will do some obvious mark to distinguish the X-out board. For example:

In our quotation page, we offer two ways to make sure you get qualified boards at your demanded quantity:

Option 1-Accept X-out option:

We'll reproduce the same quantity of bad boards in panels and ship them together with the originally manufactured panels to you. For example, if you order 5 panels each containing 20 boards, but the production ended up with a total of 3 bad boards, At last you would receive 6 panels (some of those panels will include bad boards).

Option 2 - Reject X-out Allowance option:

All boards in the panels are qualified and there are no bad boards included. This is comparatively expensive than accept X-out option.

Actually, PCBWay has successfully controlled the rate of bad PCBs within an acceptable range in panel PCB manufacturing. We recommend you accept X-out option. We will make sure you got all the qualified boards quickly and in fair price.