Our White Cardstock (KW) material is a bright white, uncoated, heavy paper stock that is compatible with both inkjet and laser printers. It is a 118# paper with a 7.6 mil +/- 10% thickness. The paper weight of 118# when converted to gsm is approximately 176. This should not curl easily when printed in a laser printer. If you do experience any issues with curling, try using a manual feed tray with a plain/unspecified paper type option.