Radius Marker, Small, 20 in Radius ORS NASCO Contoured shape and soft foam Contoured shape and soft foam nose cushion for extra comfort Highest ASTM level of fluid resistance on the market (160mm Hg) Meets CDC guidelines for TB exposure control standards The Dura Mesh® shell Soft Grade A top grain pigskin Excellent resistance to soil 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