High Power Air 6mm BB Series(Failure to use “6mm” will lead to product damage and malfunction.) Impact resistant reinforced plastic(ABS) parts Air soft series is well-received among fans for its reliable structure and remarkable reality and it will lead you to the winner in the field. Size(length, barrel, diameter): 10.7", 6", 0.35" (273, 152, 9 mm), 4 lb(1.9 kg) / 10 shots / The package size is 11.8 x 7 x 2.36". Specification Complete Product. Material: Plastic(ABS) parts From 12 years old Manual: English, Korean Made in Korea(Republic). It is an air compressor system. It has no spring. The slide is saw-toothed.