Are you still looking for a teaching apparatus for teaching the principle of field? Then, our teaching prop is carefully prepared for you. Using magnet material, it is safe and durable. A perfect physics teaching aid for you. Features -Color:Transparent -Material:Plastic, magnet -Size:15.20X10.50X2.00cm/5.97X4.13X0.79in - Using magnet material, which can be strong and durable for long serving life. - It can be used to demonstrate the field lines pattern and polarity of field. -Simple appearance and good workmanship ensure its popularity and practicality, and it is loved by buyers. - It can also illustrate the right-hand rule of the direction of field lines. - Widely applied in home, laboratory, school, university, training institution, research institute, etc. Package list: x Magnetic Needles 1 x Storage Box