Wasted money, fourth consecutive time with a similar product. Total waste of 30+ euros because I was swayed by the product's "serious appearance". Everything I write here applies to all similar products that I will rate. Hard material, nonexistent elasticity, difficult to use, definitely needs lubricant, and in the end, it doesn't have any noteworthy results but it manages to frustrate you.
Since there are generally no reviews for this type of product, don't make the mistake I made (good appearance, relatively expensive, therefore better).
I bought 4 products (all black) from 7 euros to 18 euros. All have the same hard material, all are difficult to use, all are ineffective, and in the end, they cause pain and ruin the mood.
In the end, the cheapest ones (transparent ones) are the only ones that actually have elasticity. They seem to be made of pure elastic silicone and can be easily and effectively used without pain for what they were designed for. Pressure, not discomfort and pain. I don't know what material this is, but it doesn't seem like silicone.