You might be looking for high-quality, "solid" (heavyweight) paper used for calligraphy or fountain pens. Brand names like Clairefontaine or Rhodia are often described this way.
If "solid" refers to the thickness and "girlzip" is a misspelling of a brand or technical spec, you might be looking for heavyweight cardstock or solid bleached sulfate (SBS) board used in packaging. Call girlzip
It looks like "Call girlzip" might be a typo or a very specific term. Based on the context of "solid paper," I have a few ideas of what you might be looking for: You might be looking for high-quality, "solid" (heavyweight)