Hi Ned,
Thank you for your question. Any of the photoluminescent sizes will work, depending on how much of the ramp you would like to cover. We would recommend at lest a 2" X 60' Roll that you can cut to length. If you have further questions, please feel free to call us we would be more then happy to help you, 888-355-6287.
Thank you,
The Koffler Team