I'm looking for anyone's reviews on the foam discs hip girls sells to put under the bottle caps? I just ordered them but I'm hesitant to try them out? I currently use the 1" felt pads that go on the bottom of chairs/furniture but they are a bit costly. Any reviews on these items or tips on what you use that works really well and is cheap? I currently I'm paying $4.97 for a pack of 48 at Walmart for the felt sliders. Any advice/reviews is appreciated! TIA!