MFC PRO Warning Reflector Bicycle Review

I have replaced my 40 year old reflectors on my 12 speed reflector set. At first I only had one wheel per bike, but on a fast descent the wheel vibrated due to its imbalance. It made me a little nervous. This time I replaced the single one with two smaller ones. These were respectively at the 12 and 6 o'clock positions on the wheel where the air valve was at the 3 o'clock position. At higher speeds everything seems fine.