The guns of the category EBB (Electric Blow Back) have movable slide and after each shot the next BB is automatically loaded. They are powered by 4 standard AAA batteries. The advantages of EBB pistols are the low maintenance costs and that they are also more silent. The performance, however, is clearly lower than that of AEP pistols. Unless noted to the contrary in the product details these pistols are generally semi-automatic.
The guns are made of plastic and they are supplied without batteries. BBs must also be purchased separately (BB weight 0.12g). The specific product details give more information about the package contents, and materials used.