Superior Fiberglass Sucker Rods Lighter-weight fiberglass sucker rods are inherently superior in today's industry, where higher stress ratings are mandatory. Now there is a fiberglass rod with proprietary steel end fittings that make all other rods obsolete. Deep wells, high-volume loads, corrosive and other hostile downhole conditions? No problem. Solve your most challenging well problems. Run with SUPEROD®.