Here's the answer guys and gals:
RT4 and RT5 rods from BPS are both IM9 85 million modulus graphite.
The difference is the resin and scrim material, which makes RT5 lighter and more responsive.
The Johnny Morris Signature USA Made rods, the Patriot USA rods, and the upcoming new platinum signature rods are all RT5 graphite, made in the United States by North Fork Composites.