· Muffles out sounds very well, difficulty hearing outside noise or conversation. I wanted a heavy duty bike rack and this fits the bill. OVERALL: just seems ok. But there is something about this specific sent/variety that absolutely sucks. Fit perfect So, all I needed was something to store all of my aquarium goodies nicely as underneath the aquarium was getting very crowded and hard to find anything. I get that you dont want the sliding part to bind up inside the track, but this one rattles around too much for any precision use. Fast forward one week, one bud starts randomly disconnecting. Fits 4inch duct blower perfectly! I thought the soft insulation might be hard to pull, but it pulled just fine for me under some carpet, and didnt get caught up once in the process.