This set is printed in the Extra Large size (200%) in CC3D Silk copper and Silver PLA.
PLA - (Polylactic acid) is a biodegradable material derived from corn starch or similar materials.  Silk Filament has Polyester added to give it a smooth metallic finish

​Size of Pieces  (Extra Large Set)
Height Metric    Inches
Pawn    82 mm     3.2"
Bishop  120 mm   4.6"
Knight   100 mm    4.0"
Queen  140 mm    5.6"
Rook     100 mm    4.0"
King      142 mm    5.6"