Overview
This 140-piece kit contains pre-formed U-shape jumper wires — solid-core links bent to exact breadboard spacings, with both ends stripped and angled to plug straight down into the holes. Instead of a haystack of long flexible dupont wires arcing over your circuit, U-shape jumpers lie flat against the board, turning a messy prototype into something you can actually read, photograph, and debug.
The kit covers 14 lengths (10 of each), color-coded by length so you can grab the right span at a glance. They fit any standard 2.54 mm (0.1") solderless breadboard and are the tidy way to route power rails, ground returns, and short signal hops in Arduino, ESP32, Raspberry Pi, and Pico projects.
At a Glance
Specifications
| Parameter | Value |
| Quantity | 140 pieces (14 lengths, 10 each) |
| Wire Type | Solid-core, tinned copper |
| Gauge | ~22 AWG class (standard breadboard fit) |
| Span Range | From 2 holes (~5 mm) up to ~125 mm bridges |
| Color Convention | Each length has a fixed color (consistent across refills) |
| Compatible Sockets | Solderless breadboards and 2.54 mm female headers |
| Current Handling | Comfortable for signal and low-power use (breadboard-level currents, ~1 A short runs max) |
| Packaging | Compartmented storage box |
How to Use
There is nothing to wire to this product — it is the wiring. A few habits make U-jumpers shine:
Pick length by hole count, not by eye
Each U-jumper spans a fixed number of breadboard holes. Count the gap between the two points you're linking, then take the color that matches. A jumper that's exactly right sits flush; one size long bows up and invites snags.
Route like a PCB, not like spaghetti
Run power and ground first, along the rails, using the shortest jumpers to tap rows onto the rails. Keep signal hops flat and parallel, and reserve tall flexible dupont wires for connections that leave the board (sensors, displays, the microcontroller itself). The result reads like a schematic.
Insert and remove straight
Push straight down until the jumper seats; pull straight up to remove (fingernails or flat pliers help on the short ones). Avoid wiggling side-to-side — that's what loosens breadboard contacts over time.