Purple Mighty Line Floor Dots, 3.5" wide, pack of 100. These Mighty Line dots are a great floor marking tool. Often, dots are used at dock doors to create a line. Users also build curved lines on their floor with the Mighty Line floor dots. Dots are highly recommended when forklifts are constantly dragging skids. These floor dots do not leave residue when you remove. To apply the dots, peel and stick the adhesive backing to a clean area of the floor.