... , China6. Model: SMB-gas cylinder7. Brand: Longda This series of cylinders are of Japanes standard, with many different sizes. It is a ... cylinder, there is a shock. This cylinder take advantages of the QGB Series: the body part was anodized, and with ... parts, engineering goods, etc.5. Quality control following 3 phases of thorough inspection, first-off inspection, during-processing inspection, and 100 ...