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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Gikfun Copper Magnetic Levitation Coil with Iron Core for Arduino DIY (Pack of 3pcs) EK1909

Gikfun Copper Magnetic Levitation Coil with Iron Core for Arduino DIY (Pack of 3pcs) EK1909

Product ID: 74211720

Details

Brand
Gikfun
Color
Copper
Item Thickness
12 millimeters
Material
Iron
Shape
Cylindrical

⚡0.35mm lacquered copper wire for high conductivity

🌀18.5mm precision coil diameter

🔩3mm screw hole for secure mounting

€ 30.61

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Description

🧲 Elevate your DIY game with precision magnetic coils that magnetize success!

TRIPLE PACK POWER - Get 3 premium coils for all your Arduino levitation projects—never run out mid-build.
VERSATILE IRON CORE - Robust iron core enhances magnetic levitation and electromagnetic performance for professional-grade results.
PRECISION ENGINEERING - 18.5mm diameter coils with 3mm screw holes ensure perfect fit and stability in your DIY setups.
TRUSTED BY INNOVATORS - Ranked #20 in Industrial Electrical Coils with a 4.4-star rating—join the community pushing tech boundaries.
HIGH QUALITY COPPER WIRE - 0.35mm lacquered magnetic copper wire delivers superior conductivity and durability for advanced electromagnetics.

The Gikfun Copper Magnetic Levitation Coil pack includes three 18.5mm diameter coils with iron cores, featuring 0.35mm lacquered copper wire and 3mm screw holes for secure mounting. Ideal for Arduino projects and electromagnetic applications, these coils combine durability and precision, making them a top choice for makers and professionals alike.

Specifications

ASIN	B07DFZXCBG
Best Sellers Rank	#133,785 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #20 in Industrial Electrical Coils
Brand Name	Gikfun
Color	Copper
Customer Reviews	4.4 4.4 out of 5 stars (94)
Item Thickness	12 millimeters
Manufacturer	Esooho
Material Type	Iron
Number of Items	3
Number of Pieces	3
Part Number	4348387763
Shape	Cylindrical
Unit Count	3 Count

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€ 30.61

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Slovakia.

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TrustScore 4.5 | 7,300+ reviews

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