I like the variety pack of refill strips. I have so many hooks and picture hanging products I've aquired over the last 5+ years from my dorm to my new home. It's great that the hooks really only come in three sizes. And the strips are universal for all the 3M hook products. The strips hold strong. The refill packs were once hard to find, but have become more readily available once more products were around. You really don't have to replace strips unless you are taking the hooks down or moving them. The strips last years in one spot. Since I moved every year to a new dorm or apartment (until this year in my new house) I needed replacement strips. Now I use all my hooks in my new home!