Description:PC: The propeller is made of PC material, which is durable.Waterproof: The propeller is waterproof and rustproof.Low noise: The propeller has a small shape and lower noise.Design: The propeller is designed for Royal mini, which is light in weight, good in performance and durable.Large pull: The propeller provides a strong pull.Specification:Material: PC.Size:Approx.13x8x5 cm/5.11x3.14x1.18 inches.Color: gold, sliver.Package Includes:16 Pieces Propeller Blades (4 Pairs).16 Pieces Screw.1 Piece Screwdriver.