You now have the opportunity to exchange your SG studs for FG studs. The set consists of 8 x 13 mm and 4 x 16 mm spikes. The 13 mm spikes are for the front of the shoe, while the 16 mm spikes are for the back. Universal studs that fit all shoes: Nike Phantom, Nike Mercurial, Nike Tiempo, adidas World Cup, adidas Kaiser 5, PUMA Future, PUMA ONE, PUMA King, New Balance Tekela, New Balance Visaro, New Balance Furon.