It's Wilson's pro stock frame given to Head pro's transitioning to Wilson contracts. It's a clone of the early Radical MP (Ti.Radical/i.Radical/ LM Radical), and comes in 18x20, 16x19, and rarely 18x17 string patterns. It is usually used under Wilson Burn and Wilson Blade paint jobs. Used right now notably by Nicolas Mahut, Pablo Carreño Busta, Karen Khachanov, Andrey Rublev, Renzo Olivo, Paul Henri Mathieu, etc. Originally created for Novak Djokovic when going from the Head Liquidmetal Radical to Wilson: