Pro, the price has been divided into 2 - 3 price points according to the order quantity. Ordering thousands of pieces at a time in our company or market department is also the lowest price above, so we refuse to negotiate.

Environmental protection alone, or outside the single, all need lead-free tin spray, lead-free board welding temperature needs a little higher. For normal debugging, does not necessarily require lead-free tin spray.

We can also do it, but we put forward slightly bigger requirements in order to ensure the yield. If your board circuit is very precise, less than the requirements of the factory, you can also consult our customer service staff quote.

First, beautiful, the second is to prevent easy access to the hole caused by welding short circuit. If you do not choose, tin spray will likely fill vias, then the benefits of the vias become smaller, not easy to break.