What are little black pieces for

Those are only applicable if you have a motorcycle or bicycle that you're putting these on. They're to help valve stem attachment, but if you're putting these on a car then you can just throw those away.

Do these fit presta valves for bicycles?

There is a picture indicating that it will not fit presta valves.

Yes battery go dead quick...unless you keep unscrewing them till night time...but not worth the money.. I have not had all 4 the same color work properly yet.

Color	20 Pack Wheel Light
Material	Plastic, Metal
Brand	WIROJ
Fit Type	Universal Fit
Vehicle Service Type	Passenger Car, Bicycle
Item Diameter	1.5 Centimeters
Number of Pieces	20
Shape	Round
Manufacturer	WIROJ
UPC	734010666092
Item Weight	5 ounces
Is Discontinued By Manufacturer	No
Manufacturer Part Number	WIROJ

BlueSunshine 20 PCS of Led Flash Tyre Wheel Valve Cap Light for Car Bike Bicycle Motorbicycle Wheel Light Tire (4 Red, 4 Yellow, 4 Blue, 4 Green, 4 Colorful)

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