I bought these to provide spacing between the center channel speaker and the receiver it sits on. For $8.99, this is exactly what I expected; very light and feels cheap. Given their lack of bulk, I'm not very sure about their isolation abilities. They're essentially a molded piece of plastic in a thin aluminum ring with a rubber base. For insulation, regular adhesive-backed rubber feet can work just as well, if not better. But if you're looking for something more attractive to back a component, this works great.
Nobsound Little Bear MC104 4(1)-In-1(4)-Out 4 Port 3.5Mm Stereo Audio Switcher For Passive Speakers And Headphones - Manual Selector Splitter Box In Black
42 Review
Smart column Apple HomePod mini, gray space
50 Review
Women'S Bayite Stainless Steel Bands With Frame And Rhinestone Bling, Compatible With Fitbit Blaze For Stylish Replacement Accessory Straps
45 Review
HYZUO 13-Inch Laptop Sleeve Case For MacBook Air And MacBook Pro With Accessory Bag, Mint Green Faux Suede Leather Finish
34 Review
KLIM CD Boombox Portable Audio Player with FM Radio, Rechargeable Battery, Bluetooth, MP3, AUX, Neodymium Speakers, and Upgraded CD Laser Lens (2021 Edition)
11 Review
Sangean PR-D4W Portable Weather Alert Radio with AM/FM Bandwidth Narrowing and Auto Tracking for Improved Searchability
12 Review
Experience Dynamic Audio with Panasonic SC-UX100 CD & USB Wireless Bluetooth 300W Mini Hi-Fi System Shelf Stereo
19 Review
JBL Horizon Bluetooth Alarm Clock Radio with Multiple Alarms, Soothing Ambient LED Light, Automatic LCD Display, and Dual USB Charging (White, AM/FM Radio)
41 Review