Sell Magnet Needle for Physical Laboratory Equipment Demonstrating Use

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We have two kinds of magnet needles. Ther are as follows:
E13.0306--Small Magnet Needle
10pcs/set, Needle Length 2.5cm, Stand Dia.2.5x3cm
E13.0305--Big Magnet Needle
2pcs/set, Needle Length 11cm, Stand Dia.7x12cm

This kind of product can be used in middle school and university labs for educational demonstrating experiment. It can be used to show directions clearly or to demonstrate magnetic line of force. Especially in the latter aspect, it can show clearly the phenomenon of magnetic line of force.