The Valken 330rd Infinity Metal "Flash Mag" is a 6mm AEG high capacity magazine with a pull cord for faster loading than a traditional airsoft hi-cap magazine with a winding wheel. This AEG magazine comes with a high quality pull cord system that allows you to load your hi-cap magazine in just a couple short pulls. This high capacity airsoft magazine fits most M4 or M16 style airsoft rifles, and holds 330 BBs. We recommend using our Valken Infinity BBs for use with this hi-cap magazine.