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 instantly—light up your space like a pro!

DURABLE 22 AWG WIRING - Premium gauge wire ensures stable power delivery and long-lasting performance.
COMPACT LIGHTWEIGHT - Slim 15cm cables keep your setup clean and professional without bulk.
EFFORTLESS PLUG PLAY - No soldering needed—connect your LED strips in seconds and skip the hassle.
UNIVERSAL COMPATIBILITY - Works seamlessly with WS2812B, WS2811, WS2814, SK6812, and more for ultimate versatility.
RO HS CERTIFIED OUTDOOR READY - Eco-friendly, safe connectors designed for reliable indoor and outdoor LED installations.

The BTF-LIGHTING 20 Pairs JST SM 3 Pin Connectors offer a reliable, solder-free solution for connecting popular LED strips like WS2812B and SK6812. Featuring 15cm 22AWG wires, these male-to-female connectors support up to 12V low-voltage projects, ensuring stable power and easy installation. RoHS certified and suitable for indoor and outdoor use, they are the perfect upgrade for professional-grade LED lighting setups.

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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