Command "Velcro"...it isn't Velcro, but, plastic mushrooms that when pressed into another mushroom strip hold extremely tenaciously. Now, put the 3M Command adhesive on their backs and you have one heck of a picture / mirror / clock / indoor/outdoor thermometer base station /...holding kit. You get the idea, and if in doubt of the holding power, just add more. I have all of the above mounted in our motor home and nothing moves or sags, and I've never had anything fall off the wall. Even the stuff I have mounted in the basement has weathered wild temperature swings with no failures. Things that we had mounted in our 5th wheel for 8 years came off cleanly with no indication that we'd ever had anything hanging there.