Plastic.1.Make of durable PP material shell and High-density thick EVA cushion with tough plastic plates, Anti-shock, wear-resistant,give you great protection for knee, elbow and wrist.2. Wrist bands curved elastic plate design, effectively protect the palm.3.All-round ventilation design, sports are not stuffy, double-layer design,With adjustable straps and multiple Hook and Loop closures for secure fit for various girths of knee, elbow and wrist. The sock liner wraps around the body while the straps adjust the strength of the closure for a more secure fit.4.Package: 1 Pair of Elbow pad & 1 Pair of Knee pad & 1 Pair of Wrist pad ,Appropriate for inline skating and riding bikes and scooters and skateboarding and other extreme sports.5.Size reference S: Suitable for weight below 40Kg ( Thigh circumference 35cm, Elbow circumference 32cm, Wrist circumference 26.5cm ), M: Suitable for weight 41-60Kg (Thigh circumference 46cm , Elbow circumference 34cm , Wrist circumference 27.5cm ), L: Suitable for weight 61-80Kg (Thigh circumference 48cm , Elbow circumference 35cm, Wrist circumference 28.5cm).