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!

OPTIMIZED LENGTH - 15cm cables perfectly sized for flexible LED strip setups without clutter.
PREMIUM MATERIALS - Durable PVC jacket with tinned copper core for enhanced conductivity and safety.
RELIABLE SECURE - Dust and water-resistant connectors ensure a stable, long-lasting connection.
BULK PACK ADVANTAGE - 20 pairs included—ideal for large projects or professional installations.
PLUG PLAY SIMPLICITY - No soldering needed—connect your LED strips in seconds.

The BTF-LIGHTING 20 Pairs JST SM 3 Pin Connectors are designed for WS2812B, WS2811, and SK6812 LED strips, offering a no-solder, water-resistant, and reliable connection solution. Each 15cm cable features 20AWG tinned copper wire with durable PVC insulation, perfect for both indoor and outdoor LED lighting projects. This pack of 20 male-female pairs ensures you have enough connectors for extensive or professional-grade installations.

Specifications

Brand	BTF-LIGHTING
Connector Type	3 pin male and female one set connector
Cable Type	Lightning
Special Feature	Water resistant
Colour	3-pin
Net Quantity	20 count
Item Weight	0.1 Kilograms
Indoor/Outdoor Usage	Outdoor
Number of Items	20
Wattage	1 Watts
Manufacturer	BTF-LIGHTING Teachnology Co., Limited
Part Number	3PIN-SM
Height	1.5 Centimeters
Length	12 Centimeters
Width	10 Centimeters
Style	Modern
Material	Polyvinyl chloride (PVC), tinted copper
Number of Lights	150
Special Features	Water resistant
Power and Plug Description	corded electric
Batteries Included	No
Batteries Required	No
Type of Bulb	LED
EU Energy Efficiency Label	A
Manufacturer	BTF-LIGHTING Teachnology Co., Limited

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