There are very few people choose below combined specifications.
PCB Prototype,4 layer,1.6 thickness,Yellow,HASL(with lead),1 oz copper,7628.
Thus, it takes longer to get enough such orders to combine onto a panel, and there will be an extra charge.
1. Extra $33.33 for the special process.
2. Build time: 3 more day.
We recommend you change yellow color to green as it has a shorter turnaround time and no extra charge.