teaching large magnetic triangular plate set compasses protractor teacher-specific magnetic triangle blackboard drawing circle 教学用大号磁性三角板套装圆规量角器教师专用磁性三角板黑板画圆

[strong magnetic] 5 full set-5 pieces upgraded and thickened [non-magnetic] 5 full set-5-piece set upgrade thickening [strong magnetism] 2 triangle protractor compasses 4 pieces [non-magnetic] 2 triangle protractor compasses 4 pieces [strong magnetism] 2 triangular plate + protractor-3 sets [non-magnetic] 2 triangular plate + protractor-3 sets [strong magnetic] 45 degrees +60 degrees triangular plate-2 sets [non-magnetic] 45 degrees +60 degrees triangular plate-2 sets [strong magnetic] 45 degrees triangular plate [upgrade thickening]] [non-magnetic] 45 degrees triangular plate [upgrade thickening]] [strong magnetic] 60 degrees triangular plate [upgrade thickening]] [non-magnetic] 60 degrees triangular plate [upgrade thickening]] [non-magnetic] 100cm ruler [upgrade thickening]] [non-magnetic] dual-use compasses [upgrade thickening]] [strong magnetic] protractor [upgrade thickened materials]] [non-magnetic] protractor [upgrade thickened materials]]

teaching ruler