CDs or compact disk, used in data collection, recording the song and various computer programs by CD one sheet can contain data in the form of numbers, to 783, 216 000 bytes. Or can save the music up to 74 minutes by eating areas. Only 12 cm diameter. When looking from the appearance, the CD is the only plastic plain. With the thickness of 1.2 mm CD mainly contain, polycarbonate plastic, forming with the method of plastic injection into the model. A stamping welded convex with very small and invisible to the eyes. A convex these with a groove arrangement information. Spiral coil is long and so on. When the polycarbonate sheet was sprayed aluminum reflective layer on the sheet, to close a nun them. Then spray. I acrylic thin. On to protect the floor aluminum again and printed labels, and details on the อะครีลิค.
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