My Sonic toothbrush is an ideal tooth brush that is lightweight and portable. It gives you the regular brushing with the sonic action, which makes it an extra ordinary tooth brush. The brush has sonic handle inside that strokes 20,000 times in a minute. The bristles are made from DuPont Nylon fibers that give consistent brushing. Each brush comes with 1 year supply of brush head, that is 3 heads each and each head will last for 4 months. The front tip bristles on the brush are specially coated with blue color so that when the color fades away it reminds you to change the brush head soon. The My Sonic brush runs on 1 AAA batteries that can be replaced easily. Details: • Mascara style vented cap keeps the brush dry and clean after use. • 22000 Strokes per minute. • Size; 2 x 1 x 6.5 inches. • DuPont Nylon Bristles. Sold in Packs of 2 in color combination as per below: 1) Black & White 2) Lime Green & White 3) Red & Black 4) Red & Blue 5) Brown & White 6) Lime Green 2 pcs 7) Black 2 pcs 8) White 2 pcs 9) Blue 2 pcs 10) Red 2 pcs 11) Brown 2 pcs What you will get in each order: 2 set of brushes in combination selected above, 6 Replacement Brush heads.