PIAO Kid's Children Skateboard Rollerblades Roller Skating Cycling Blading Palm Elbow Wrist Knee Protective Pads Blades Guard 6pcs Set Palm Protector Size: 5" x 3.25" (12.7 x 8.3cm)(L * W ), Fit Palm Girth: 7"-8.7"(18-22cm) Elbow Protector Size:4.5" x 3.75" (11.4 x 9.5cm)(L * W), Fit Elebow Girth: 7"-8.7"(18-22cm) Knee Protector Size:5.25" x 4" (13.3 x 10cm)(L * W), Fit Knee Girth: 10.6"-11.8"(27-30cm) Made of durable, soft EVA padded material with tough plastic plates Adjustable hook and loop strap system