Skybox texture packs are built specifically for 3D game engines. Each pack comes with 12 sets of skybox textures, that is 6 images per set for a total of 72 images. Also if your team is developing a game using Garage Games' Torque Game Engine (www.garagegames.com) a seventh texture is supplied for each skybox as well as the accompanying .DML files. (www.iinit.com)