Made of ABS plastic, Size: 3.2 * 4.5cm. Color: Black Yellow Green Blue Pink Orange Red White (8 Pack) Instant Reset Knob easily use to restore as zero and comfortable finger grip firmly hang up your finger. Compact design and portable, it comes with a metal hoop for carrying or attaching to a key ring, perfectly fits in the palm of your hand. No batteries required and counts up to 9999 for enormous figure. Only takes a few turns to reset for easy and quick, no need to cycle through 9999. Simple to use and works as you expected. Widely applied to various occasions, for example, school, laboratory, competition, stadium, casino, restaurants, bars, training activities and other events.