These are 20-22 Gauge Quick Solder Tubes.
FEATURES: Quick repair for broken wires at track or flying field, simply insert
stripped ends of wire into each end of tube and apply heat lightly
to shrink tubing and solder around wires
INCLUDES: (25) 20-22 Gauge Quick Solder Tubes
REQUIRES: Heat source such as heat gun, match, lighter, or hobby torch
SPECS: Length: 1.6" (41mm)
Inner Diameter: 0.16" (4mm) one end
Inner Diameter: 0.12" (3mm) opposite end
COMMENTS: Warning: This solder contains lead.