How strong are they? What's the recommended max voltage?

The coils are about a 28 AWG gauge. Voltage is not the concern, it will be how many Amps your circuit requires. Of course the combination dictates the power. I have put 48v through them with several Amps with minor heat. With out cooling they will carry 5 Amps without issue. The cores are iron. Well made, nice tight, uniform wind.

So to get the levitation to work, you need 4 coils, but you only sell 3 in a pack, why?

A marking scheme, I would speculate. A bit like the hot dogs and buns, never the same count, lol. A good coil, though.

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🧲 Elevate your DIY game with magnetic precision and pro-level copper coils!

PREMIUM COPPER BUILD - Polished copper finish guarantees superior conductivity and durability for advanced electromagnetic applications.
COMPACT LIGHTWEIGHT - Only 12mm thick and 68g total weight—engineered for seamless integration without bulk.
TRIPLE PACK ADVANTAGE - Get 3 high-quality coils in one pack—more value, more creativity, more innovation.
VERSATILE DIY ESSENTIAL - Ideal for transformers, motors, solenoids, speakers, and electromagnets—empower your Arduino projects with pro-grade components.
PRECISION ENGINEERED COILS - 18.5mm diameter with 3mm screw hole ensures perfect fit and stability in your DIY projects.

The Gikfun Copper Magnetic Levitation Coil pack includes three 18.5mm diameter, 12mm thick copper coils with 3mm screw holes, designed for high-performance electromagnetic projects. Perfect for Arduino enthusiasts and professionals building transformers, motors, solenoids, and speakers, these polished copper coils combine precision engineering with durable materials to enhance your DIY innovations.

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Manufacturer	Esooho
Part number	4348387763
Item Weight	68 g
Package Dimensions	5.08 x 5.08 x 1.52 cm; 68 g
Manufacturer reference	4348387763
Colour	Copper
Finish	Polished
Material	copper
Shape	Cylindrical
Item thickness	12 Millimetres
Item Package Quantity	1
Number of Pieces	3
Batteries included?	No
Batteries Required?	No

GikfunCopper Magnetic Levitation Coil with Iron Core for Arduino DIY (Pack of 3pcs) EK1909U

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