A full page of thermal pad! Make your own sizes to fit anything you need. The System Builders Thermal Pad Full Sheet starts at 310mm x 310mm (12.2" x 12.2") and is 1.5mm thick. Both sides have a protective plastic that can be peeled once ready to apply.
Thermal pads and thermal compound are used to fill air gaps caused by imperfectly flat or smooth surfaces which should be in thermal contact. Please consult your installation manual prior purchasing to see size and thickness is correct for your EK water block.