It's the spare face that came with TT Inferno with a hanger / adapter peg you can order on Shapeways for it (It's listed as "Tesla adapter". No modding required...it fits right in the helmet and it's a perfect fit. Definitely is Perceptor when you compare it to the toon. I think the peg was like $1.35 or something silly like that. Definitely the best Shapeways I've ever ordered.