What is the difference between stranded and solid wires?

solid is well...solid. Stranded is made up of alot of really small wires. Solid is great for bread boarding because they are "stiff" stranded is great for making wires longer (say a power cord as an example) because the wire is more flexible.

Some reviews seem to disambiguate this but are they truly spools of solid single-conductor copper wire?

Yes, this is copper hook-up wire. That means the wire is tinned - solid copper with a thin outer layer of tin, before the outer layer of insulation. It is not a copper alloy as Phillip stated.

I'm planning to solder wires to solder points on circuitboards. Should I use stranded or solid? 22ga is good?

I prefer stranded for hook-up wire to circuit boards. Solid wire tends to break easily at the solder joint with excessive movement, which could be just enough when soldering other wires to the board. Stranded wire, provides a flexibility that solid does not have. Pre-tinned stranded wire is the best in this situation, it is bonded to be stiff like a solid wire and easily solders to the via. The stiffness of Pre-tinned wire allows you to bend the wire like a solid and it will hold its shape, and flexible enough to not break. guitarpcb dot com has the pre-tinned wire that is the best I have found.

noob question but i need some wires for a raspberry pi, can i just use cat5 cable and use the wires from it since i can keep the casing?

Cat 5 would be fine for raspberry pi. I use old cables for quite a few of my projects. Look into using sprinkler wire braided as you get 18 gauge wire 7 colors and 100 feet of what it costs for the ones sold on amazon.

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Solid Hook Up Wire Kit (Tinned Copper) 22 Gauge (6 Different Colored 25 Foot Spools Included), 150

Solid Hook Up Wire Kit (Tinned Copper) 22 Gauge (6 Different Colored 25 Foot Spools Included), 150

Product ID: 1244378

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Details

Color
(6 Different
Brand
EX ELECTRONIX
Material
Copper
Number of Cable Strands
Single Strand
Gauge
22.0

⚡300 Volts

🌈6 Colors

🔌22 Gauge

Description

🎨 Wire Your World with Colorful Precision!

DURABLE DESIGN - Flame retardant and resistant to water and oil.
EASY DISPENSING - Comes in a convenient box for hassle-free access.
COLORFUL VERSATILITY - Six vibrant 25-foot spools to match any project!
PROFESSIONAL QUALITY - Perfect for both DIY enthusiasts and professionals alike.
SINGLE STRAND STRENGTH - Solid copper construction for reliable conductivity.

The Solid Hook Up Wire Kit by Electronix Express includes six 22 gauge solid wire spools, each 25 feet long, in vibrant colors: red, black, green, yellow, blue, and white. Made from tinned copper with PVC insulation, these wires are rated for 300 volts and are resistant to water, oil, and flames, making them ideal for a variety of applications.

Specifications

Color	(6 Different Colored 25 Foot Spools Included)
Brand	EX ELECTRONIX EXPRESS
Material	Copper
Number of Cable Strands	Single Strand
Gauge	22.0
Voltage	300 Volts
No. of wires	6
Manufacturer	RSR Electronics Inc
Global Trade Identification Number	00632963308727
UPC	632963308727 782247633219
Part Number	27WK22SLD25
Item Weight	8 ounces
Product Dimensions	10.25 x 2.25 x 2.25 inches
Item model number	Solid
Is Discontinued By Manufacturer	No
Size	22 Gauge
Item Package Quantity	1
Included Components	Six 22 Gauge Solid Wire Spools (Red, black, green, yellow, blue, white), One Dispensing Box
Batteries Included?	No
Batteries Required?	No

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