Ever hear of Yin-Yang? Think it is just a cool symbol? Think again. Yin-Yang is actually a positive and negative cycle. The inventors of the Q-Ray bracelet are attempting to use your body's Yin-Yang to help keep your body balanced and improve your overall "Chi". Product includes: Q-Ray Natural Finish. Bracelet Size Wrist Circumference X-Small Under 6 Inches Small 6 to 7 Inches Medium 7 to 7 3/4 Inches Large Above 7 3/4 Inches Always read and follow manufacturer's directions that come with this product.