Bearings reduce the friction that hinders the movement of the gears, which means they reduce power consumption and improve the rate of fire. The bearings are especially suitable for stock power High Speed builds. These should not be used in any super straining builds, like DMR or DSG, because their small size makes them less durable to the strain caused by e.g. M180 spring.
SHS as a Manufacturer:
SHS is a Hong Kong/China based airsoft manufacturer which makes upgrade parts designed especially for electric airsoft guns (AEGs). The product range is constantly growing and improved generations of the older products of SHS are also released based on the feedback received from airsoft players.
SHS is acknowledged as one of the best in the airsoft industry when talking about upgrade parts. The SHS gears, pistons and motors, among others, are used also by more experienced airsoft mechanics. Furthermore, the unbeatable quality-price ratio of the upgrade parts is absolutely at the top end of the airsoft industry, which works as a clear competitive advantage for SHS.