Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 4 " Louver Vent Face Material problem

I had bought 200 pcs for a project used. The 200 pcs you send to me has two different type of material. One PVC is soft and good. a lot is hard pvc with is easily crack. I did not count how many quantity for that. The hard PVC material type of Louver Vent face cannot last long under rain and sun. Will be crack after time. Even during installation the screw had break the vent cover. I feel disappointed.