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.

Manufacturer	グッドイヤー(GOODYEAR)
Brand	グッドイヤー(GOODYEAR)
Model	GY1069
Package Dimensions	39.5 x 25.6 x 9.19 cm; 2.21 kg
Item model number	GY1069
Exterior	Painted
Special Features	4 Gauge, PVC Hard Case
Color	4 Gauge, 16 Feet, Navy Hard Case
Item Weight	2.21 Kilograms

Goodyear GY1069 ヘビーデューティジャンパーケーブル 16フィートロング 4ゲージ厚エマージェンシーブースターキャリーケース付きすべての車両に対応銅製コンタクト

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