For quality of the product, you have get the sample and the result is OK.
then you decided to order the 25kg.
we could promise that we could ship the best quality product to you.
if you still worry about the quality, you could arrange people to test the 25kg before shipping out of our factory.
but I am sorry that we couldn't bear the shipping fee.
on the other hand ,if the problems occurs ,there may be lots of reasons ,why it must be my goods quality?
Frankly speaking,25kg is a trial order qty, and l am looking forward to the long time cooperation with you in furture, not only for the once time cooperation.
so l would like to ship the good s to Guangzhou city with free.
if you are still in doubt, I really don't know what to help you. I have to delivery the goods to another European customer.