Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: I understand there is a builders model with plastic hinges & a showroom model with metal hinges which ones does this unit have.
Document: I like the cabinet, and purchased 3 of them. I read all the reviews complaining about the plastic hinges. I emailed Kohler imploring them to send me the metal parts  before I even opened the boxes and before installation-and got a phonecall the very NEXT day, from Kohler telling me that they are sending me the metal parts........Now that's  GOOD  Customer service!!!!!!! !
I read a lot of reviews when before purchasing and saw many earlier reviewers had issues with plastic hinges but the recent specs indicated they are now metal. I purchased and am very happy with the cabinet. The only plastic parts are the mirror-mounted door frames and the clips that hold the glass shelves. Everything else is sturdy metal or glass. The cabinet has mirrors inside and out and looks great. Maybe I'm biased because my old cabinet was small and chopped up, but this cabinet has tons of space.
Overall the cabinet was worth the money. However, the hinges on the doors are exposed whether you surface mount the unit or recess it.It does not have a very attractive side view.
Awkward outside mount. Sharp metal corners cut  my finger and gouged up my wall.Hinges do not disconnect from cabinet.There are similar products to this without all the baggage and at a lower cost.Probably works better as an internal mount, but if you are planning to hang it on the exterior side of the wall you should look elsewhere. In either case watch out for the sharp corners
Bought this about 2 years ago. Nice appearance and were happy up till now. The hinges have a black plastic component on the interior of the hinge. The plastic snapped and then one door wouldn't close. The hinge on the other side broke about 6 months later and now neither door closes. I can't find replacement hinges that match. If I can't find a replacement I'll be forced to rip out the whole freakin thing and replace it after only two years.
If they have plastic in it, they WILL break after some time. Another reviewer also commented on bad hinges.
Not a good thing to happen in a bathroom with bare feet! Thanks for everyone's input! I'll call Kohler tomorrow morning and then append my comments. . . Kohler replaced the mirror door and all of the broken and unbroken plastic hinges quickly and no cost.
Our medicine cabinet is labelled "Robern CLC3026FS". The cabinet is large, sleek looking, and well priced. But it has (or at least the older models had) a manufacturing defect. Like other reviews have mentioned, the hinges have a plastic part which has a tendency to snap. However, Kohler's customer service is superb. We called the number listed on the tag (800.877.2376 #2).
Put four of these great looking cabinets into two bathrooms during remodel 3? years ago. One hinge broke forcing door to stay open so I pulled pieces of the plastic hinge out until the door would close. Second hinge broke on the same door. I did the same thing and now there is no spring to hold the door closed.
Purchased to replace a smaller recessed unit. Had to cut a couple studs and frame with 2x3's. Ensure doors are removed to install cabinet level and your done. No divider inside like the big box stores. Very good quality for the  money.
Answer: our unit had metal hinges.