■Product Contents These are power LED chips with aluminum substrates (heat sinks). I purchased them for a project but am selling them as I haven't had the opportunity to use them. • Condition: Unused item • Quantity: 22 pieces (everything in the first image) • Substrate size: Approximately 20mm in diameter • Light color: White (according to purchase information) ■Product Features • Since they are already mounted on a 20mm heat sink board, you can use them by simply soldering the wires. • Ideal for DIY, custom lighting, aquarium backlighting, repair of floodlights, etc. ■Notes • Although unused, please understand that these are stored items before purchasing. • Separate LED drivers, resistors, and heat dissipation measures are required for lighting. We recommend purchase by those with specialized knowledge. • The bag (packaging) has scuffs and dirt from storage, but the contents are not affected.