what are the mils thickness of this tarp? 4 mils economy or 9 mils heavy duty?

This is not 9 mil. It is definitely thinner like a standard camping tarp.

How does it hold up to sunlight exposure?

Fine. No problems. Great tarp for the money.

Why does Amazon not clearly put tarp's thickness in the description?

I bought this tarp and it is pretty thin. I used it to cover a outdoor sectional sofa when it would rain. It held up well for the year. It is not a heavy duty tarp, and is not substantial. If you are looking for a sturdy long term tarp this is not heavy enough.

ASIN	B0748HGDVD
Best Sellers Rank	#305 in Sporting Goods ( See Top 100 in Sporting Goods ) #1 in Camping Tent Tarps
Brand	Amazon Basics
Brand Name	Amazon Basics
Center To Center Spacing	36 Inches
Color	Dark Green
Colour	Dark Green
Country of Publication	China
Customer Reviews	4.6 out of 5 stars 7,620 Reviews
Global Trade Identification Number	00841710195590
Included Components	Tent.
Item Dimensions L x W	3.66L x 3.05W Meters
Item Type Name	Camping tarp
Item Weight	2.2 Pounds
Item weight	2.2 Pounds
Manufacturer	Amazon Basics
Manufacturer Part Number	AMZ-T1012
Material	Polyethylene (PE)
Material Type	Polyethylene (PE)
Model Number	AMZ-T1012
Number of Items	1
Recommended Uses For Product	Camping
Size	9.5' x 11.3'
UPC	841710195590
Ultraviolet Light Protection	true
Unit Count	1 Count
Water Resistance Level	Waterproof
Water resistance level	Waterproof

Amazon Basics Waterproof Camping Tarp - 9.5 x 11.3 Feet, Dark Green

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