These high performance Mejzlik props feature hollow blades fabricated from uni-directional and bi-directional carbon fiber and epoxy. While very light, they are super strong, with a solid hub area allowing them to be drilled for Multi bolt hubs. The finish is a beautiful high gloss,clear epoxy gel-coat over black woven carbon fiber. All are factory balanced.Mejzlik props are among the quietest props available. Vertical performance is spectacular along with excellent downline breaking.