Metal lips. The top lip came off after 2 or 3 uses. Reordered more and still the same issue. Without it you risk tearing the fabric because the head is 2 pieces split vertically down the middleWhat was the deaign flaw on the dimasterI love the tool - just ticked they didn't do anything for those of us who bought version 2 with its design flaws. They should have done a trade in or something for version 3. Kind of hate to give my money to companies who lack good customer service.