STERILE Surgical Face Mask Whiteboard Two pith balls suspended on

Two pith balls suspended on unspun silk string to test for charged objects

spinal nerves

Diameter 40mm

rounded tip

12mm diameter

STERILE Surgical Face Mask Whiteboard Two pith balls suspended onIncludes: STERILE Surgical Face Mask Individually Sterilized and Packaged. Quality Certification: EN14683: 201+ YY 0469 2011, this sterilized surgical mask meet the highest quality standard. Fluid resistant to help reduce potential exposure of the wearer to blood and body fluids. Bacterial filtering efficiency 99. 5%. Ventilation resistance 49 Pa (Gas flow: 8L min). Designed for use in professional medical fields but is an ideal choice for science