THESE HOOKS WORK PERFECTLY IN A CLASSROOM! They're GREAT for hanging POCKET CHARTS and filing charts--the metal gromets on the charts fit perfectly over the metal hooks. I've never had one to fall off the wall because of the weight of the chart! Very sturdy. Another great way to use the metal hook kind...if you need to hang posters for different units, hole punch in two places at the top of each chart to match the hooks on the wall, then rotate! Easy!!! As you change units, change out the posters! Take off the old one, pop on the new one! (Love all the 3M hooks!)