-Mathematical Instrument Box in your Hand is a result of our Excellent Craftsmanship and R&D. -Both Divider and Compass are made with not-rusting strong Material to last long and remain in shape and shine. -For safety and long lasting life of every sharp edge points we suggest to secure them with provided cap. -Every instrument is designed and developed by us with all safety measures of its user. -The plastic used in ruler protractor and set square are made of high transparency plastic and comes with precise marking for east reading and accurate.