One of my favorite suppliers for plastic tubing is the Markel Corporation-P.O. Box 752-Norristown, PA 19404 (610-272-8960/ 610-270-3138 fax#). They are a great supplier of insulating sleeves. Some of their products are:

• FLEXTITE TEFLON TFE-Extruded tubing of DuPont Polytetrafluoroethylene
• FLEXTITE TEFLON TFE-250-Extruded and expanded tubing of Dupont Polytetrafluoroethylene
• HYGRADE THERMOFLEX 1200-Tightly braided fiberglass sleeving
• HYGRADE THERMOFLEX 500- Tightly braided and pigmented fiberglass sleeving
• FLEXITE SR-200-Extruded silicone rubber tubing
• HYGRADE SR-398-Silicone rubber coated fiberglass sleeving in Grades A, B and C-1
• FLEXITE SHRINKDOWN HA-150-Semi-rigid extruded and expanded modified polyvinylidene fluoride
• HYGRADE POLYTUBE 463-Acrylic coated fiberglass sleeving in grades A, B and C-1
• FLEXITE SHRINKDOWN LM-145-Very flexible extruded and expanded modified polyolefin tubing
• HYGRADE VF-Vinyl coated fiberglass sleeving in Grades A, B and C
• FLEXITE SHRINKDOWN PO-135 CLEAR-Extruded and expanded polyolefin tubing
• FLEXITE SHRINKDOWN PO-135 COLORS-Extruded and expanded polyolefin tubing
• FLEXITE HT-105C-Extruded vinyl tubing
• FLEXITE SHRINKDOWN HT-105-Extruded and expanded vinyl tubing
• FLEXITE H.W. SHRINKDOWN HT-105-Extruded and expanded vinyl tubing

Sleevings are good for doing wiring assemblies that have pickups with exposed braided shield similar to the Gibson humbuckers designed by Seth E. Lover. The sleeving helps keep the bare insulation from hitting contacts on switches and volume and tone controls.