Hogue G10 AR15 Grips, Piranha pattern are made of G10, a high-pressure thermoset plastic laminate consisting of multiple layers of woven fiberglass mesh cloth impregnated with an epoxy resin binder. G10 means that grips like the Hogue G-10 Piranha Grips for AR15 / M16 can be produced with many layers of the same color, or different colors to achieve a specific cosmetic look. Typical G10 is made of only flat layers. Hogue Inc. has a new, patent-pending method of producing G10 material called G-Mascus. This method produces different patterns within the colored material which produces a unique look. This material gives the Hogue G10 Piranha Pattern Grips for AR15 & M16 a similar look to Damascus steel - hence the name "G-Mascus". Hogue G10 AR15 Grips, Piranha pattern is part of Hogue's unrivaled selection of G-10 grips and mainspring housings. All Hogue Grips and mainspring housings are precision machined from blocks of G10 and G10 G-Mascus composite then hand finished and inspected for consistency, quality and fit.