No son resbaladizas y son faciles de lavar. It maybe more expensive compared to the 1st unit I bought, its so much heavier and is like a quality coaster , so it doesnt move all over the place during use. Je ne recommande pas malheureusement. Good product, although not as good as Utopias product. I would have bought sooner but the price went way up. I really like this speaker , i used to buy bang and olufsen products and this was for the test and it is really great buy , it is quite loud in its size ( do not expect too loud sound in this size ). The red color did not match my powerbeats and these slipped off pretty easily. The locking tab seems to do its job, although it feels weaker (softer) than OEM, so it might not remain effective over time. Other Thule & Yakima expensive $500+ models didnt have enough clearance, even the swing out units I tried. Pics may be dark but doesn’t cover or emphasize the crap I got.