Hello Havard,
Since the PETG tubing is soft and has lower melting point, that's why it is easier to scratch pretty. We advise you to choose the acrylic tubing, such as following links.
Any question, feel free to contact us.
https://shop.bitspower.com/index.php?route=product/search&search=NCCLT12AC-
https://shop.bitspower.com/index.php?route=product/search&search=NCCLT14AC-
https://shop.bitspower.com/index.php?route=product/search&search=NCCLT16AC-