local size = 20;

while true do
    for _, player in pairs(game.Players:GetChildren()) do
        local character = player.Character;
        if character then
            local hitbox = character:FindFirstChild("HeadHB")
            if hitbox then
                hitbox.Size = Vector3.new(size, size, size)
                hitbox.CanCollide = false
            end
        end;
    end
    
    wait(0.1)
end