Note that this is not a NdFeB magnet. From the outside, it is indeed the same as a neodymium magnet, but in fact it is made of ferrite with a coating on the surface for magnetic therapy, such as knee pads, waist pads, neck pads, shoes, Pillow can be used, the picture below shows its magnetic force, the highest is about 800 Gauss.
If you change to neodymium magnets, at least some have thousands of Gauss!

Bread-shaped magnets for the same purpose;
Polished disk ferrite bread magnet for insole dia 8mm x 4mm thick
Ferrite grade, sintered ferrite magnetic property parameter table
NdFeB magnet grade, Sintered neodymium magnet performance grade parameter table
Neodymium(Ndfeb) Magnet Material Safety Data Sheet
Sintered Ferrite Material Safety Data Sheet Pdf
Magnetic properties grade parameters of smco rare earth magnets
This is a very small rectangular ferrite block magnet, measuring 2.45 mm in length and 1 mm in both width and height. It is magnetised along its length and is barely noticeable when held in the hand....
7.4x6x5mm Ferrite Small Block Magnet Introduction,Material: Hard Ferrite (Ceramic),Shape: Block / Rectangle / Bar,Coating: No Coating,Grade (Chinese Stardard): Y30,Operating temperature: -40°C to 250°C,Delivery time: 7-15 days,Magnetization direction: thickness....
Have you ever seen such a small ferrite rectangle/block magnet? This is a ceramic ferrite magnet of 2mm in length, 1.5mm in width and 2mm in thickness, with black surface and Y30BH grade. It is suitable for all kinds of electronic parts, precision electronics and medical products requiring magnetism. If you are processing small, thin and flat ferrite permanent magnet suppliers, we will be a good choice for you....
This ferrite ring magnet is manufactured using high-temperature sintering technology, featuring an outer diameter of 8mm, a 3mm square center hole, and a thickness of 3mm....
To buy round ferrite magnets, welcome to contact Courage permanent magnet manufacturers in China, our company has many sizes of ceramic round, block, arc, hole ferrite magnets, factory direct sales, low price, welcome Inquiries from customers all over the world....
This is a radial 2-pole ferrite rotor magnet, the outer diameter is 9mm, the height is 10.4mm, the inner hole is oval, it has low cost, high temperature resistance, and the maximum surface magnetic field strength is about 1130 Gauss. Welcome to consult the sample and price....
The sample is a regular radial magnetized ferrite circular magnet with a diameter of 5mm, a thickness of 2mm, a black surface, and an anisotropic grade. It is magnetized radially and has strong side magnetism, with a surface magnetic field intensity of about 750 Gauss....
This product is a round ferrite magnet with a diameter of 10mm and a thickness of 5mm, produced in China, without any surface treatment, axial magnetization, performance level Y30. Single/double chamfering, spray painting and baking varnish can be customized according to customer requirements. Welcome to inquire about samples and prices....