Do these stretch over plugs while the wire is skinny and the plug is fat?

No, they don't stretch that much. I think its 2 to 1 ratio. I don't think it will work for you.

Are these flame retardant rated?

Retardant, yeah, fireproof, naw. I use a Bic lighter to seal mine up. Couple of seconds under the flame, bingo all done. Will they burn, yeah probably, if your battery pack explodes.

What is the listed voltage rating of this heat shrink?

I don't know as I was using it for low voltage.

Is this set free of adhesive? I need tubing that is not adhesive-lined.

These are adhesive free. They only require heat to shrink them to seal whatever you are sealing

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⚡ Shrink your worries, not your style!

DURABLE FLEXIBLE - Withstands extreme temps (-55°C to +125°C) and resists acid, alkali, and aging for long-lasting insulation.
COMPLETE KIT FOR PROS - 650 pieces in 8 sizes, neatly organized in a portable case—perfect for electrical, RC hobbies, and tech repairs.
FLAME RETARDANT SAFETY - Certified UL224 & VW-1 for top-tier fire resistance, keeping your projects safe and compliant.
PRECISION FIT EVERY TIME - 2:1 shrink ratio ensures a snug, professional finish on wires from 1/24" to 2/5" diameters.
ECO CONSCIOUS CRAFTSMANSHIP - Made from RoHS-compliant, heavy-metal-free materials—protect your gear and the planet.

The innhom 650pcs Heat Shrink Tubing Kit offers UL-approved, flame-retardant, and eco-friendly insulation solutions with a reliable 2:1 shrink ratio. Designed for durability and flexibility, it covers a wide range of wire sizes and withstands harsh conditions, making it the ultimate professional-grade accessory for electrical protection and cable management.

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Manufacturer	innhom
Part number	HS-650B
Item Weight	209 g
Package Dimensions	21.79 x 15.9 x 4.09 cm; 209 g
Item model number	HS-650B
Size	650pcs
Colour	Black
Material	plastic electrical heat shrink tubing
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No

innhom 650pcs Heat Shrink Tubing Black Heat Shrink Tube Wire Shrink Wrap UL Approved Ratio 2:1 Electrical Cable Wire Kit Set Long Lasting Insulation Protection, Safe and Easy, Eco-Friendly Material

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