They use North Fork Composites blanks. I have built on them with decent success (BB805, XRay Neo MB765, Xray SJ703). Did break one lifting on a snag (SW768), but NFC sent me a replacement blank for no charge. The built ones (Edge) seem a bit overpriced, but NFC runs lots of blank sales and you could likely get one built by a local rod builder for a decent price if you so please. I would recommend the BB805 or BB806 for fluke/blackfish. Lots of guys use them locally in NJ.