How to make a selection box red?

function nvg(p)
	p.CharacterAdded:connect(function(c)
		Instance.new('SelectionBox',p.Character).Adornee=c
	end)
end

for _,p in next, game.Players:GetPlayers() do
	Instance.new('SelectionBox',p.Character).Adornee=c
	nvg(p)
end
game.Players.PlayerAdded:connect(function(p)   
	nvg(p)
end)

How do I make it red?

local sb = Instance.new("SelectionBox", p.Character)
sb.Adornee = c
sb.Color = BrickColor.new("Really red")