This sticker is specially designed to hold securely your magnetic band permanently to your tank. It also serve as a template to mark where to install it. First, setup your magnetic band using the rubber band. When you are sure of its position, slide the sticker under it with the white frame aligned to the band. Use a sharpie to make a mark on your tank with the help of the four outside cutouts in the backing paper. Remove everything from your tank, remove the backing paper and stick it to the trigger. Then line up the center top and bottom white lines with your marks and apply the sticker from it's center working your way out. Always keep an eye on the alignment marks and keep it as straight as possible.