Changing on material:color,shape,construction: Acceptable
All products must go through five checks before manufacturcing process.
Every produciton line is equiped in a individual Qcand they are another 2 QC in charge of the half-done and well-done production.
Revelant materials check before production.
full check after every individual process finished.
full check after production half-done.
General inspection on fixing before packing
spots check after production packed before shipping.
Every defective product or quality problem(besides the damage during transporation can be replace in the next order).
Any defective product or quality problem which cause customer's losses can be compensated in their next order.