An alien coil, or alien clapton is a coil design that evolved from the clapton coil. A core of thicker wire (or grouping of wires) is wrapped within an outer coil of thinner gauge wire much like a clapton, but in the case of the alien build, the outer wire wraps are made from wires that have previously been coiled and has been stretched and partially re-straightened before wrapping again to give the waved effect seen in the photo above.
Ordinary alien clapton coils have three equal sized cores, wrapped with ‘alien’ wrap, which is made by making a single core clapton thats 1/3rd of your final core width (if you are making 3 x 26 gauge aliens, your de-core ‘alien’ wire is made by wrapping a thinner gauge around one 26 gauge wire). Once wrapped you slide the outer clapton wrap off the core wire, stretching out the coils before finally wrapping them onto your three core wires. This gives the wraps the wavy appearance you see in alien clapton coils.
‘Alien’ wraps can be used on pretty much any kind of core coil, so long as the de-cored clapton outer wire was made on a base core thats roughly 1/3rd of the diameter of your intended final cores. Some examples of commonly ‘alien’ wrapped coils are;
Alien Framed Staples
Alien Framed Multicore coils
Alien Twisted Strands
Fused Alien coils
Some of the more exotic variations of ‘alien’ wrapped styles include: