Casing

Shells are special blocks in MaddTech, used mainly in constructing multi-block structures, such as chemical reactors. There are 3 types of shells: tin, steel and lead, and they are used for different structure. Each type also has input and output versions for energy, items, fluids and redstone. You can also use an input/output shell in place of a normal shell. This way, you can decide which part of a multi-block's shell is used for energy input for example.