Material: Pro-environment plastic + brass Suitable for Arduino starter beginner Specification: Resistor every one 10 PCS: 100 ohm (1/4W) , 220 ohm (1/4W), 470 ohm (1/4W), 1,000 ohm (1/4W), 2,200 ohm (1/4W), 4,700 ohm (1/4W), 10,000 ohm (1/4W), 22,000