My pete models carbon fiber spinner has an thin aluminum backplate, the spinner itself is carbon fiber. This backplate is much thinner aluminum that a trueturn type, because the retaining screws goes in the side and don't put pressure on the backplate this backplate is 1/2 the thickness and weight of a true turn type and has no knurls. I sent it to pete models and had it knurled but the knurls are much less pronounced than what you see on a trueturn.

http://www.geocities.com/pierrejac/cf-spinner.htm

PS: pete modeles is also making a Mejzlik clone prop that is on the average one oz lighter than a mejzlik. you can see them at troybuilt.com