1. No battery required.2. Self-contained mechanism dynamical balanced gyro ball.3. Increase your wrist strength while having fun. Wrist and finger grasp strength.Forearm`s muscles strong.The vibration

1. No battery required.2. Self-contained mechanism dynamical balanced gyro ball.3. Increase your wrist strength while having fun. Wrist and finger grasp strength.Forearm`s muscles strong.The vibration

Specifications:1. No battery required.2. Self-contained mechanism dynamical balanced gyro ball.3. Increase your wrist strength while having fun. Wrist and finger grasp strength.Forearm`s muscles stron

Glass tube thermometer,Back: paper

1) diameter:15,18,20,25,30mm2) waterproof3) temperature range: -20~504) mini thermometer

Dynamic: non-battery. Non-electricity.It is powered by rotating the wrist. The faster we rotate the ball, the stronger the dynamic and torsion is produced. The speed of rotationCan reach over 12, 000

1) . Non-liquid compass2) . ABS material3) . Jeweled pivot4) . Luminous dial for direction in darkness5) . Double magnifier structure for easy readingSize: 73x56x25 mm

1) thermometer with red or blue indicator2) -30 - +50oc

1) . Liquid-filled compass2) . ABS material3) . Double magnifier structure for easy reading4) . Jeweled pivot5) . Floating luminous dial for direction in dark4) . Size: 73x56x25mm