Nanoxia Coolforce Rubber Core,10 mm Diameter 52 cm Length Cooling CF1-RC 50 Cf 10 mm rubber Core for hard tubes When using a heat source, like a heat gun, the PETG tubes easily can be bended or deformed. With a Little technical skill, it is thereby possible to create a truly individual water cooling system. IN order to prevent the PETG tubes (or Acrylic tubes as well) from folding over after being heated, we offer this rubber Core. Gives PETG tubes the necessary stability to reach the level of bending desired without breaking it. Insert rubber Core into PETG Tube before you heat it up, and remove it when Tube has Cooled off. The rubber Core can be used with the cool for CE PETG tubes or other Acrylic tubes with an inner Diameter of 10 mm. The length is 52 cm.