Audio Bastion Heavy Duty Levitation Feet for Hi-Fi. Made from polished Stainless Steel, T6061 Aluminum, Zirconia Ceramic precision balls, plus Silicone Cushion to accurate tolerances. They are designed to look fabulous and considerably reduce vibration in all hi-fi equipment. You will notice an immediate improvement to the sound quality. Typically, improved sound stage, harshness removed from high notes and more clarity, detail, and solidity. On AV equipment a clearer crisper picture will be seen as well.Used properly, these feet will give you many years of reliable service and improved enjoyment of your beloved hi-fi equipment. For high-end audio, this would be the most cost-effective upgrade you can make. I would not want to be without them if you don’t agree, just send them back.X-PAD REF Speaker spike pads 3-Layer Design, Kills bad vibration Proudly Designed in the USA Outer Diameter:50mm; Thickness:15mm; T6061 Aluminum Platforms Zirconia Precision Balls