This comes as a 10m roll and is 1cm wide.I have put on my stairs bannister,and side of stairs floor.also surrounding my hallway mirror and above the bathroom toilet.It needs light to shine on it for a while and then when the light is off shines bright luminous green.I am going to also put some on my tv remote control as i like watching tv in the dark and my son always misplaces the remote control.it can be used on light switches as well and many other places.