Are these threads polyester? Cotton? or something else?

On the back of the package is reads: 100% Polyester and on each bobbin it reads the same, 100% Polyester

What colors are included in this set? Is color 1870 in this set?

The colors are: Dark gold (color 2040), gold (color 1970), beige (color 2725), black (color 1000), dark blueish black (color 6950) and dark grey (color 9455)

Are there 2 thicknesses of thread? product info says "two different sewing threads"..."extra strong 100 m" & "jeans thread 200m". only 1 kind in pic.

If I inspect each bobbin of thread with a magnifying glass, all bobbins seem to be of the same size of thread. On the back of the package, there is only one mention of needle size which is: NM 90-110. Furthermore, only one thread size is mentioned on the back of the package which is: No 50. Hope this answers your question.

ASIN	B07QC3MXXC
Best Sellers Rank	#549,735 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #825 in Sewing Thread
Brand	Gütermann
Brand Name	Gütermann
Colour	Multicoloured
Country of Origin	USA
Customer Reviews	4.8 out of 5 stars 3,559 Reviews
Global Trade Identification Number	04029394479663, 08720094812021
Included Components	Thread
Item Length	100 Metres
Item Thickness	0.25 Centimetres
Item Type	THREAD DENIM 6 SPLS DENIM
Item Weight	99 Grams
Manufacturer	A&E GUTERMANN CONSUMER DIV
Material	Polyester
Material Composition	100% polyester
Material Type	Polyester
Product Care Instructions	Tumble Dry

Gutermann Professional Jeans Denim Thread Set - 6 x 100M

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