G-10 is a high pressure fiberglass laminate / composite material.

Comes in different thicknesses - can be used as Liners and Handle scales. 

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It is created by stacking multiple layers of glass cloth, soaked in epoxy resin, and by compressing the resulting material under heat until the epoxy cures.

G10 is also used for underwater applications due to its strength, durability, and highly water-resistant properties