Today we are taught about the ruthlessness of advertising copy, keeping it short, calls to action, active sentences. However, every now and then I enjoy reading promotions that are well written by someone that takes pride in their product descriptions and catalogues.
Of all the things that I think stand out for me is the use of parentheses in promotional writing. The old school is not afraid to use parentheses to provide more context or give a little more meaning. Some might think if it's in parentheses then its superfluous, but to me it can add a little fun.
It may seem silly when you're competing so heavily for the consumers time but just adding a little flourish to your usual pared-back promotional copy might be a nice change (give it a try, I dare you).