Material: The Emitting diode lamp beads are made of resin and silver plated iron. They are high temperature resistant, have strong refractive index, no bubbles and impurities, and have high brightness. Long Life and High Efficiency: This LED lamp bead adopts built in ESD and has high light efficiency to ensure a long service life. Multifunctional Application: LED Diode Lights are very suitable for home lighting, car decorative lights, advertising multimedia, smart home, digital systems, etc. Easy to Install: 10mm round head lamp beads are easy to weld and have good heat dissipation performance. Size: round head straight plug led lamp beads, 5.16mm x 5.16mm x 3.165cm/0.20inch x 0.20inch x 1.25inch. Specification: Operating current:150 mA Overall dimensions:10mm V:1.8-3.4 V Lighting angle: 30 Power:0.5W Luminous efficiency:45-50 Im Model:10mm round head lamp beads Size Chart: 5.16mmx5.16mmx3.165cm/0.20inchx0.20inchx1.25inch Package Includes: 100 pieces 10mm round head lamp beads Note: Please allow slightly errors 1-2cm differences due to manual measurement.