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.

10 Pairs JST SM 3 Pin Connectors for WS2812B WS2811 WS2812 SK6812 LED Strip Female Male 15cm 20awg Wire

Product ID: 253743432

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Details

Brand
BTF-LIGHTING
Cable Type
JST SM
Compatible Devices
LED Light LED
Connector Type
Jst Sm 3 Pin
Recommended Uses For Product
LED Strip LED

⚡20AWG wire

📏15cm length

🔌3-pin JST SM

Description

💡 Illuminate Your Projects with Ease!

DURABLE DESIGN - Built to last with high-quality materials, ensuring reliable performance for all your lighting projects.
SOLDER FREE SOLUTION - Say goodbye to soldering hassles—plug and play for instant results!
SEAMLESS CONNECTIVITY - Effortlessly connect your LED strips with these 3-pin JST SM connectors.
VERSATILE APPLICATIONS - Perfect for WS2812B, WS2811, and SK6812RGBW LED strips—your creativity knows no bounds.
COLOR CODED CONVENIENCE - Easily identify wire polarities to ensure a flawless connection every time.

The BTF-LIGHTING 10 Pairs JST SM 3 Pin Connectors are designed for seamless connectivity with WS2812B, WS2811, and SK6812RGBW LED strips. Each connector features a 15cm length and 20AWG wire, allowing for easy, solder-free installations. Perfect for both DIY enthusiasts and professional projects, these connectors ensure reliable performance and versatility in your lighting applications.

Specifications

ASIN	B01DC0KIT2
Best Sellers Rank	#13,538 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #15 in Track Lighting Connectors #143 in LED Strip Lights
Brand Name	BTF-LIGHTING
Cable Type	JST SM
Compatible Devices	LED Light Strip, LED Bulb, Low-voltage LED Project
Connector Gender	Male-to-Female
Connector Type	Jst Sm 3 Pin
Customer Reviews	4.7 4.7 out of 5 stars (1,117)
Indoor Outdoor Usage	Outdoor
Item Weight	0.1 Kilograms
Manufacturer	BTF-LIGHTING Technology Co., Limited
Maximum Voltage	12 Volts
Model	3PIN-SM
Number of Pins	60
Recommended Uses For Product	LED Strip Connection, LED Bulb Connection, LED Project Connection
Specification Met	RoHS
UPC	602938070973
Unit Count	20 Count
Wattage	1 watts

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