These bottle openers are approximately 8x3.5". They are filled with three very powerful neodymium magnets to let them stick to the surface of your fridge or toolbox with no issue, while also catching and storing a large number of bottle caps. No more trying to catch them, or sweep them off the floor the morning after! We line the back of our openers with a sheet magnet, which provides a better magnetic surface area for mounting, as well as prevents scratching of the surface.