Thomann Crystal Singing Bowl CCC 6,5"

I bought these clear crystal bowls for test, since I have been really happy with Thomas Tibetan bowl series. These came well packaged with really sturdy travel case. Tone D is from 4th octave if anyone is interested. Bowls were also beautiful looking. Sound with even slight touch is sharp and clear, more my taste than regular crystal bowl. However all of these bowls are extremely thin. Thickness is barely 2mm, which is really little for even these type of bowls. This smallest bowl of mine weights only 400grams and even tiniest touch from mallet cause the bowl loos balance. I'm really struggle to decide keep these or not, I really like to look and sound of them, but they feel so fragile that I'm afraid to use them.