Is the Joby tripod only for metal surfaces? Can it be used on wooden tables or on the ground, in the bush

JOBY GripTight GorillaPod Video Mount and Tripod for iPhone 6/6 Plus and iPhone 6s/6s Plus

JOBY GripTight GorillaPod Video Mount and Tripod for iPhone 6/6 Plus and iPhone 6s/6s Plus

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