Completely useless, went straight to the trash. And although the photo may deceive us as it shows it much larger, we assume that the rubber or elastic point that presses the chest will be normal. And because we are talking about our health, a plastic 4-point cannot press our chest in the sea, as it can cause serious injuries, as a small screw cannot withstand such high pressures, just a slight pull. The company repeatedly releases dangerous products on the market.