TweenInfo

TweenInfo is the global constructor used to configure a Tween.

local info = TweenInfo.new(
    1,
    Enum.EasingStyle.Linear,
    Enum.EasingDirection.In,
    -1,
    false,
    0
)

Set the repeatCount argument to -1 to repeat forever. See the full TweenInfo datatype reference.