Take your Key Loop and Travel Tube Sets along every day. Odors travel well in these Aluminum Tubes. 5 scented Q’s inside each tube. SCENTED Q’S will be inside the tubes unless you request them to be empty. NACSW, UKC, CPESS, PSD and C-Wags get 1 small drop of oil on each Q. AKC gets 2 drops of oil on each Q. Colors may vary depending on stock.