I got a set of these last year to replace a damaged case and Eco-Friendly ones (with the recycle symbol being a hole on the case) because the inserts eventually get punctured.
Both disks are securely held in place.
These use less plastic then the original design, but keep the case solid!
They look great, and have already held up better then the Eco
...
-Friendly ones.
Great product at a good price! 