Thanks for your inquiry. The data sheet for our white gloss laser product lists a basis weight of 57# and a basic size of 25” x 38”. The data sheet does not list a gsm value, but I was able to locate a calculator online that uses the provided values to calculate the gsm of the material: http://www.casepaper.com/resources/calculators/grammage/ Based on the specifications from the data sheet the white gloss laser material is 84 gsm.