PRINT - The files labeled PRINT are saved as EPS.
WEB - The WEB files are saved as PNG.
Use the files labeled PRINT if you are going to have something printed. They will look good no matter what size you use them. You must have a PostScript printer to print them.
To save these images on your computer, right click the link with your mouse and choose the option to "save". Clicking on the image beside the descriptions will only give you a web-quality image which will not be satisfactory for most uses.