(Registered trademark of SII Drilco). Commercial name for a particular manufacturer's heavy weight drill string made with extra length tool joints. The pipe has a wear pad at the middle of the joint. (Bul D20)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}