The Pen-Vac Pro is 5" long by 1/2" round. The plastic static dissipative body provides ESD protection at a lower cost. The kit contains the following 6 Buna-N static dissipative vacuum cus and ppobes. PVB-CB-18, PVB-CB-14, PVB-CB-38, PVS-CB-18, PVS-CB-14 & PVS-CB-38.