They are heavy duty corner rounders in two sizes (pink-1/2" & blue-1/4")! They will corner round anything & everything, ie: chipboard, tin, leather, acrylic, and much more! To make them even better, they have a lifetime warranty!
Ok... Enough of the sales pitch... However, let me just say that if you are addicted to handmade books/albums as I am, then you simply MUST invest in these babies!