These tubes were created from royalty free images to the best of my knowledge. Ones that are not made from clip art are made completely from scratch by me and are copyright to me. You are welcome to use them in anyway you like as long as you do not alter, rename or resell the images in any form. They can be displayed on commercial web sites as far as I am concerned as long as they remain as they are and I still retain the "credit" for creating from scratch where applicable and for creating the tubes from royalty free images to the best of my knowledge.