FFI has been selling Proni Group products in the North American market for more than 20 years.
Proni Group, headquartered in Bologna, Italy, is an historic company that develops intelligent components for precise and rapid window and door installation. Rapid Spacers are faster, easier, more accurate, and more cost-effective than the shims of history. Proni products are employed by top window & door manufacturers, and are especially useful as a structural load bearing shim for lift slide door that have passed Miami Dade Building Code hurricane testing.

See product details here https://fenestration.net/door-hardware/rapidspacers/, and at their website, https://www.pronigroup.com/