The outer stainless steel sphere (in the center of the image) contains a smaller inner sphere (or core) made of copper. (sciencedaily.com)
We're excited that Piranha Games, creators of MechWarrior Online, are sharing their incredible roster of Inner Sphere BattleMech models with us for BATTLETECH. (kickstarter.com)
Though he is not exempt from temptation and conflict, [yet] in that inner sphere in which his true life lies, the struggle is over, the victory already achieved. (religion-online.org)