10Pc Permanent Blue Marker and pen used in studies9012 10Pc Blue Marker Permanent Description: 9012 10Pc Blue Marker Permanent. Its design is very ease going and very handy in order to use it clearly without any problem or facing any disadvantage. It is made under the consideration of users concern, which makes this product safe while using it. You can use it everywhere just because of its small size and ongoing mobility and take it to everyplace, where you want to use it for your needy purposes.