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.
It's possible this is a niche product name or a mishearing of a term like "Kraft paper" or a specific "Gsm" (paper weight) rating.
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.
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:
To make sure I'm giving you the right info, could you tell me a bit more about what this paper is used for? For example, is it for , crafting , or perhaps industrial packaging ?