I used them as a structural pad. The back is not solid, so not as strong as the hard plastic pad I previously bought. If you're using a tile spacer, this isn't as important.
π§ Grace IceWaterShield Roll
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Self Adhesive Neoprene Rubber Foam Sheet 6"X6"X3/4", 4 Pack - Anti Vibration, Insulation & Noise Reduction Pads
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