They are of pretty good quality - a lot thicker than I thought they would be.
When I went to the store they were also 50% off - Score.
I got two 21 7/16 inch stainless steel rails for $4.99 and two 13 7/8 inch rails for $4.50.
If anyone is interested it's only $10 for the complete set. Of course I had to spend three hours looking for a parking spot and another six hours walking through IKEA trying to locate the product but it was worth the savings.