This passage is mainly talking about the advantages of LED plastic flashlights.
The stack shells materials of led torch lights must be taken into account. General materials of led torch lights can be divided into two types: aluminum and plastic / polymer.
LED plastic flashlights have a variety of shapes made of plastic or polymers materials, because the plastic can be easily processed into the desired shapes. You may find flat, circular LED plastic flashlights, and so on. There are thousands of plastics and polymers, so I won't describe one by one here. In general, expensive Led Torch would use better plastic, which can withstand more impact.
Choosing plastic materials to make LED plastic flashlights has some good. Such as the color of the LED plastic flashlights would be the same; scratches will not show so easily; the plastic is flexible, so it will not easy to appear the scratches. Plastic materials are also able to do LED plastic flashlights with very bright colors, and you can easily find your LED plastic flashlights. For example, you go hiking, camping, or when the backpacker, then theLED plastic flashlights would be appropriate.