how much this headset weight?

I can't give you an exact number, but they are fairly lightweight. In comparison to my old Turtle Beach x11s, they are lighter. When wearing them on your head, you barely feel any weight.

Does it have 7.1 surround sound?

Yes it has 7.1 sound As u see in the picture the dedicated usb audio card 7.1 surround sound if u like

Questions & Answers: SteelSeries Siberia v2 Circumaural Full-size Headset - Black

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SteelSeries Siberia v2 3.5mm Connector Circumaural Full-size Headset - Black

18Hz-28KHz
3.5mm Connector
9.84 ft. Cord Length

Out of Stock