Anti EMF- Energy Wristband with neg. Ions Dear Customer: PLEASE MEASURE YOUR WRIST and DON'T ORDER IF 8.5 inches IS TOO SMALL OR TOO BIG.THANK YOU! Energy Wristband with 1500 negative Ions ( read more about the effect of ions below), improves circulation and lessen fatigue Ground up Germanium infused in natural silicone to emit negative ions. REDUCES EMF AND AND CELLULAR RADIATION EFFECT. Negative ions are proven to lower the damage caused by positive Ions (e.g. cellphones) IMPROVES CONCENTRATION and MUSCLE STRENGHT. WATERPROOF for surfing and watersports