Police arrested seven people on Tuesday for selling metal bracelets they falsely claimed said improved blood flow.

According to Japan Today, among those arrested were the 60-year-old president of a Tokyo-based health appliances company selling the bracelets and his six former employees.

The suspects reportedly fooled 18 people into buying the bracelets worth a total $59,330 from February to October. Their modus operandi is to check the blood of victims and show microscope images of "clogged red blood cells."

The scam then included telling victims that the images indicate that their blood is not flowing smoothly, thus convincing them to buy the bracelet.

The suspects will conduct another blood test for users of the bracelets and tell them that their blood flow have improved.

The Japan Times said the Sankyo Corp. led by the arrested Minoru Kajimoto earned $21 million by selling the product to 8,200 people, mostly elderly, in 40 prefectures in Japan. The firm sold each bracelet from $1,748 to nearly $4,000.