100% copper or copper plated aluminum?

I looked at the wire strands where they are crimped to the copper jaws. Cannot see any aluminum in the strands. I cannot say for sure they are pure copper though. I can say the cables appear high quality. The case as well. Cost is lower than any advertised as 100% copper. Your decision to make.

Are these rubber and will the remain flexible during the northeast winters?

Yes the insulated cables are nice. They should last winter weather conditions. I live in Chicago area, winters can be bad but the i did order another jumper cable case because once I took cables out of the current case it was very difficult to put cables back in case.

There are conflicting answers to whether the wires are 100% copper or plated aluminum. Can anyone confirm? Packaging shows a picture of copper wires.

I would say copper. Hope this helps

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Goodyear Heavy Duty Jumper Cables for Car Battery – 4 Gauge 16 ft Booster Cables with Carrying Case for Cars, Trucks, SUVs, Emergency Roadside Kit

Product ID: 344829798

⚡4 gauge heavy-duty wire for max power

📏16 ft extra-long reach for versatile use

🛡️Weather-resistant PVC insulation

¥22168

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Never get stranded—jumpstart your drive with Goodyear power!

POWER UP FAST - 4 gauge thick cables deliver rapid, reliable jump-starts every time.
TIDY TRAVEL READY - Includes a rugged carrying case and cable ties for organized, hassle-free storage.
REACH WITHOUT LIMITS - 16-foot length lets you connect vehicles easily—no awkward repositioning needed.
UNIVERSAL COMPATIBILITY - Works seamlessly with cars, trucks, SUVs—your all-in-one roadside lifesaver.
BUILT TO BRAVE THE ELEMENTS - Durable, weather-resistant insulation keeps cables flexible and ready in any climate.

Goodyear Heavy Duty Jumper Cables feature robust 4 gauge wiring and an extended 16-foot length for efficient, flexible vehicle jump-starts. Designed with premium weather-resistant PVC insulation, these cables maintain performance in extreme conditions. Compatible with all vehicle types and packaged with a durable carrying case, they’re an essential, reliable tool for any emergency roadside kit.

Specifications

ASIN	B07MWL3YR2
Best Sellers Rank	232,953 in Automotive ( See Top 100 in Automotive ) 1,968 in Car Batteries & Accessories
Brand	Goodyear
Customer Reviews	4.8 4.8 out of 5 stars (1,636)
Date First Available	6 Feb. 2019
Exterior	Painted
Guaranteed software updates until	unknown
Item Weight	2.12 kg
Item model number	GY1069
Manufacturer	Goodyear
Manufacturer part number	GY1069
Model	GY1069
Package Dimensions	26.9 x 26.01 x 8.41 cm; 2.12 kg
Special Features	Extra Thick for Faster Charge

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