Are you still looking for a teaching apparatus for teaching the principle of field? Then, our teaching prop is carefully prepared for you. Using needle, plastic material, it is safe and . A perfect physics teaching aid for you. It is one of the for you. Features -Color:Assorted Color -Material: needle, plastic - Size: 8.00X2.00X1.00cm/3.14X0.79X0.39in - Size: 5.00X2.50X2.50cm/1.97X0.98X0.98in - Using needle, plastic material of premium quality, strong and for long serving life. - It can be used to demonstrate the field lines pattern and polarity of current 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: 8 x Sets of Magnetic Needles 1 x Magnetic Stripe