Magnetic ball trocars are offered with an external silicone valve and an internal ball valve with a working length of 95 mm and variant diameters such as 5.5, 10.5 and 12.5 mm. All magnetic ball trocars are offered with threaded and un-threaded cannulas in addition to a trocar obturator which may have a pyramidal, auto-shield or oblique auto-shield tip.