Because it is made of cement on the inside, it has a much larger volume than the equivalent metal one, which makes it particularly impractical, especially for dumbbells.
You might say, didn't you know? I knew, but I didn't expect such a difference. For those who are considering it...

It is very good for someone who just wants to exercise. Quality-wise, it is not perfect and it slips a bit. But overall, I consider it a good and affordable choice.

It is very good for someone who just wants to work out. Quality is not perfect and it slips a bit. But overall, I consider it a good and affordable choice.

It is very good for someone who just wants to exercise. Quality-wise, it is not perfect and it tends to slip. But overall, I consider it a good and affordable choice.

I do not tighten the bar too much and I have never dropped them down, nor have I touched them roughly/with force.
They already have small cracks in some areas. They will open soon.
The quality of the material is very poor, prefer anything else to have peace of mind.

Unacceptable. After 5 months, it opened up and it's releasing sand/dirt. (It never fell and always handled correctly and on a rubber base). Stay away, wasted money.

Two stars purely because of the low price. Otherwise, if I had the option to see them before buying, I wouldn't choose them. The hole should have been a bit narrower and reinforced at that point, as the screw of the barbell essentially goes in like a wedge and instead of tightening it, it wears it down (clearly a fault of the disc and the screw). The color of them is awful, completely different from the other weights.

It's great. I have been using them for months now and they are still in excellent condition. Also, they weigh exactly 10 kilograms as they should

The plastic opened from the first week of use without mishandling since they never touched a hard surface but only a rubber surface of about 1cm thickness and they never fell with force but I always touched them with great care.

They are excessively bulky for their weight (2.5kg). Their width is 4cm and their diameter is 20cm. The large width they occupy on the barbell limits the combinations with other discs. Of course, they are very economical compared to equivalent metallic ones.

I have it for a while, it has no problem, it's just cheap-looking compared to other more expensive disks

Individual use and not particularly frequent. But for the money, if you don't want to throw it on the floor with a lot of weight, it seems to withstand. Of course, it is made of cement and not iron

Thin plastic with filling.. Bulky but economical. If you know how to use it, it's great.

I have them for about a month. Because it is not metallic, it has a slightly larger size than this metallic 5kg one. The plastic has a cap at the bottom and I don't know how it will withstand over time. So far, I haven't had any issues.