Wiring pencil or wiring pen wire is supplied on plastic bobbins or wire spools as refills.
Two types of prototyping spooled wire are available:

• Insulated Solderable enamel wire or self fluxing wire (QSE) – in two sizes – 0.15mm dia. (38swg) and 0.19mm dia. (36 swg). The spools of wire are supplied in a variety of colours for colour coding and to aid identification.
• Non-insulated Tinned Copper Wire (TCW) – 0.25mm dia. (33swg)

Applications for the Roadrunner prototyping wire, which is coloured solderable enamel wire or self fluxing wire, include:

• Discrete components, logic, microprocessors and Surface Mount Technology (SMT) circuits
• Shorting links, PCB track repair and modifications

Applications for the Roadrunner tinned copper wire (TCW), which is uninsulated, include:

• Entry level discrete component circuit wiring, and Surface Mount Technology (SMT) circuits, shorting links, pcb track repair and modifications

The coloured Solderable Enamel Wire conforms to IEC 60317-20.