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SODIAL(R) Teaching Instrument Coffee Color Plastic Chalk Circle Drawing Compasses.
Hard plastic pencil compasses with mechanical pencil lead, used for drawing circle or circular arc.
Black rubber suction cup can make it steady at blackboard.
Geometry tools, especial suitable for teacher teaching use.
SODIAL(R) Teaching Instrument Coffee Color Plastic Chalk Circle Drawing Compasses - B00JVIKW0K