Today I inspected XX products at your factory, the whole quality improved compare to last batch. But small size charcoal color products used wider pvc piping again, cause the same problem like last batch, this made me very surprised. Please tell me how to avoide same incident happen again. I inspected all 180 pcs products, 156 pcs are qualitified and can be shipped out, the rest 34 pcs please rework on them and inform me to inspect again.