Exactly one week has survived the shell intact and we must have looked the fact that I'm fussy about such things and therefore carefully handled them. The tablet was several days almost untouched on my desk. When I last took it in his hand, the plastic edge of the envelope had tears, a piece broke off shortly thereafter. Probably the part to be seated well, is too tight around the tablet.
A total bad buy for me so. I therefore recommend that the artificial leather cover of Splin because there is nothing that can break.