what gauge is the wire?

Seller is misinformed or lying - it's nowhere near 20 gauge. Maybe 24 or 26.

Will this work with the ws2812b 5mm width led strips?

It should. It lists ws2812B in the title and narrative. Hope this helps.

How do you connect jst sm 3 pin connectors to the arduino uno board and power the led's?

These connectors are for the WS2812B or neopixels, they are individually addressable so if they are in a strip you can control the color and intensity of each led. They have a positive, negative and a data connection. For more detailed information go to adafruit.com, they have wiring diagrams and sample code.

Is this just the connectors or is the ribbon cable attached to the connectors?

The ribbon cable is attached to the connector.

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Description

🔗 Connect Brilliance Effortlessly — Light Up Your Space Like a Pro!

EFFORTLESS PLUG PLAY - No soldering needed—connect your LED strips in seconds and save time for what really matters.
UNIVERSAL COMPATIBILITY - Seamlessly works with WS2812B, WS2811, WS2814, SK6812, and more—future-proof your LED setup.
COMPACT DURABLE DESIGN - Slim 12cm cables with PVC insulation ensure neat, safe, and long-lasting connections.
BULK PACK FOR BIG PROJECTS - 20 pairs included—perfect for scaling your creative LED installations without running out.
RO HS CERTIFIED OUTDOOR READY - Eco-friendly and reliable connectors built to withstand indoor and outdoor environments.

The BTF-LIGHTING 20 Pairs JST SM 3 Pin Connectors are precision-engineered plug-and-play cables designed for WS2812B, WS2811, WS2814, SK6812 LED strips and bulbs. Each 15cm cable features durable PVC insulation and supports up to 12V low-voltage projects, eliminating the need for soldering. This bulk pack of 20 male-to-female connectors is RoHS certified and suitable for both indoor and outdoor LED lighting applications, making it an essential toolkit upgrade for LED enthusiasts and professionals alike.

Specifications

Brand	BTF-LIGHTING
Cable Type	JST SM
Compatible Devices	LED Light Strip, LED Bulb, Low-voltage LED Project
Connector Gender	Male-to-Female
Number of Pins	60
Unit Count	20 Count
Item Weight	0.1 Kilograms
Specification Met	RoHS
Indoor/Outdoor Usage	Outdoor
Wattage	1 watts
Maximum Voltage	12 Volts
Manufacturer	BTF-LIGHTING Technology Co., Limited
UPC	602938070973
Part Number	3PIN-SM
Item Weight	3.52 ounces
Product Dimensions	4.72 x 3.94 x 0.59 inches
Item model number	3PIN-SM
Batteries	15 A batteries required.
Is Discontinued By Manufacturer	No
Assembled Height	1.5 centimeters
Assembled Length	12 centimeters
Assembled Width	10 centimeters
Style	Modern
Number of Lights	150
Specific Uses	Indoor use only
Power Source	Corded Electric
Batteries Included?	No
Batteries Required?	No
Type of Bulb	LED

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