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

Input:
Question: is there a difference between these and the Design modern ones (eiffel chair)? these are cheaper $$ but what about quality?
Document: I LOVE my new replica DWS Eames side chairs! I got them in white, yesterday. They were really easy to assemble and feel very sturdy and nice. I was a little afraid because they are so much cheaper than the real ones but they are GREAT. I have real DWS side chairs at work and they are TOTALLY comparable, hard to tell the difference. Highly recommend if you love the originals like me and were saving up. I saved more than double the price!
I do not recommend this replica.I have bought quite a lot of replicas and I am generally happy with them - those chairs are the only ones I really have quality issues with.
Once set up these chairs are fine and the quality is on par with the price.Major issue with setup being that the two of the threads on the base of the chair where the screw for the legs go were malformed. Plastic was too thick to thread the screws to attach the legs, this required 20 minutes of sanding and filing down the plastic so that the screws could actually be put in.
I was really excited about these chairs. However, I have to agree about the quality.When they first arrived, I was surprised about the plastic. It is textured, and more cheap-looking than it appeared in the photo. The legs are a nice beech wood, but the black plastic feet have worn out a little already.The metal supports that attach the legs to the seat are the biggest problem. After a larger friend visited, the chair seat was left tilted forward.
I purchased these to go around a boardroom table for an office, the chairs are surprisingly comfortable and look very modern around a refurbished wood table. Worth the price -recommend.
This product contains formaldehyde. If you do not think that formaldehyde belongs in your home do not buy these. The design and construction are great, formaldehyde is not great!
We got two white ones for almost the same price as one identical green one. Super comfortable with a deep seat. A nice surprise was that all the legs came assembled and you just screw the seat on top. Hooray!
These chairs have a european, modern look, yet are built to stand up to kid "rough-housing". They were super-easy to assemble, shipped fast (ha, Amazon Prime!) and, shoot, what a great price. Did I mention they are actually comfortable? Yep, I am very happy to finally find the chairs that fit my needs for a reasonable price!
We ordered 6 of these chairs (3 orders of 2). They were super easy to put together. We didn't have any of the issues others had. No missing parts and all the chairs were perfectly level. One set came without the extra washers, but they weren't even needed anyways. Surprisingly comfortable and just the modern look we were looking for. Look quite close to the real thing except the plastic is rough rather than smooth - which is fine considering the real think costs $400 each.
These are reasonably well constructed and in images look like Eames shell chairs. We compared to our originals and the new ones sit much higher and level, material is an odd textured plastic (think sandblasted), there are no rubber mounts but rather a thickened plastic section on the bottom of seat, shell is narrower than original, metal rods are a bit thicker. If you like the look and don't care about the original they are decent everyday usable. They certainly would not pass for originals nor DWR plastic shells.
Answer: They are pretty heavy duty plastic. they are made in china. but Lets just say I weigh 240 ( dont judge me) and I stood on one to replace a light bulb and it was very sturdy. No problems.  We love them. We are pretty picky so you could say if they were junk or anything less then perfect I would have returned them.