Radius Marker, Medium, 50 in Circumference ORS NASCO scientifically heat treated to hold scientifically heat treated to hold their edge Excellent dexterity and tactile sensitivity with textured fingertips Ambidextrous and have a beaded cuff for easy donning Guards against incidental splashes Made of a highly durable nitrile polymer Powder free and latex free Precision tools made of rust proof aluminum and anodized for lasting protection The arms are precisely aligned with spring tension joints to guarantee accuracy and rigidity The holder accommodates flat or round soapstone and pencils All are a folding type design the three smaller models will fit conveniently into a shirt pocket All have sturdy friction joints to maintain rigidity and accuracy