These little wine wands filter out nitrates and sulfates, the ingredients that affect most people by giving them headaches, migraines, and/or triggering allergies. They are particularly useful in red wines (which I love). They are advertised as "one use", but I have used a wand in 2 glasses of wine and it's worked for me. There are 30 wands in this box. Retail price is over $50 (from their website). Amazon advertises $25, but not sure about availability. This box is brand new, safety sealed.