Pen Vac Pro Series, V8910-9BK-ESD. Brand New PRO-SERIES PEN-VAC With 4 Probes & Cups – ESD-Safe Black Plastic Body -Three bent probes 1/8″ (3.18mm) 1/4″ (6.35mm) 3/8″ (9.53mm) and one straight probe 1/4″ (6.35mm) diameter Static Dissipative Buna-N cups.