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

Product ID: 253743432

Details

Brand
BTF-LIGHTING
Connector type
JST SM 3 Pin
Item dimensions L x W x H
12 x 10 x 1.5
Item weight
0.1 Kilograms
Material
PVC plastic

⚡Supports up to 12V power

🔌3-pin JST SM connectors

🛠️No soldering needed

¥4639

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔗 Connect with confidence, light up your world effortlessly!

BULK PACK FOR PROS - 20 pairs included—ideal for large projects or multiple setups, so you never run out mid-build.
PERFECT 15 CM LENGTH - Optimized cable length for neat, professional installations without excess clutter or tension.
RELIABLE 3 PIN DESIGN - Precision-engineered JST SM connectors ensure secure, stable connections for flawless LED performance.
PLUG PLAY SIMPLICITY - Effortlessly connect WS2812B and SK6812 LED strips without soldering—save time and avoid hassle.
DURABLE WEATHER RESISTANT - PVC insulation and tinned copper cores protect your setup from dust and moisture—built to last indoors.

The BTF-LIGHTING 10 Pairs JST SM 3 Pin Connectors are precision-made, no-solder cables designed for WS2812B, WS2811, WS2812, and SK6812 LED strips. Each 15cm connector pair features durable PVC insulation and tinned copper wiring, supporting up to 12V power with reliable, weather-resistant performance. Perfect for professional-grade LED installations, this pack of 20 pairs ensures seamless, secure connections that save time and elevate your lighting projects.

Specifications

ASIN	B01DC0KIT2
Brand Name	BTF-LIGHTING
Cable Type	JST SM
Connector Type	JST SM 3 Pin
Customer Reviews	4.6 4.6 out of 5 stars (1,132)
Item Dimensions	12 x 10 x 1.5 centimeters
Item Length	15 Centimeters
Item Weight	0.1 Kilograms
Manufacturer	BTF-LIGHTING
Material Type	PVC plastic
Model	3PIN-SM
Number of Items	20
Number of Packs	20
Part Number	3PIN-SM
Recommended Uses For Product	wall
UPC	602938070973
Unit Count	1 Meters
Wire Diameter	0.5 Millimeters

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