Trion Z Broadband Wristband. Size XL (8.5 Inches, 22 Centimeters). Color is Black. Broadband combines the power of negative ions and magnets in a unique combination unlike other sports bands on the market. Broadband is loaded with negative ion producing minerals. Broadband also utilizes twin 100mT (1,000 Gauss) magnets in a Alternating North-South Polarity Orientation to increase penetration and magnetic field flow. It's wide bandwidth provides absorption, making it ideal for strenuous sports and activities. TIP! Broadband is hand washable, and will maintain its ion power even after repeated washings or water sports.