Are these hand warmers re-useable?

No, they are one time use once activated.

what's the shelf life?

Each package has an expiration date on it.

What is the quantity? I see it says 40, but wanted to make sure, especially at this price.

You get a package of 2 regular sized warmers -- not the 40 minis that the description says. I just received my order and am returning them. $3.71 for one hand warming session seems a little steep.

Brand	HotHands
Color	No Color
Material	Iron
Recommended Uses For Product	Camping, Cycling, Fishing, Football, Golfing, Hiking, Hunting, Skating, Skiing, Snowboarding
Charging Time	10 Hours
Included Components	golf-accessories
Reusability	Single Use
Upper Temperature Rating	158 Degrees Fahrenheit
Power Source	Disposable Air-Activated
Manufacturer	Heatmax
UPC	947330758938 001910578702 066510466736
Global Trade Identification Number	00094733075893
Item Package Dimensions L x W x H	5.63 x 4.06 x 0.28 inches
Package Weight	0.04 Kilograms
Item Dimensions LxWxH	2.99 x 2.28 x 0.79 inches
Item Weight	0.03 Pounds
Brand Name	HotHands
Model Name	Heatmax Hot Hands Mini Hand Warmer
Suggested Users	unisex-adult
Number of Items	1
Part Number	3662046
Style	2 PACK STANDARD
Sport Type	hunting

HotHands Hand Warmer 2-Pack

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