This case for the Samsung Galaxy Core Plus is a unspecified plastic, most likely a silicone type. Unlike other silicone cases, but it is not nearly as "sticky" ("unrutschig" - I just find no fitting word) and also not as soft but dimensionally stable and relatively smooth. I like that. Processing defects are noted on the lateral, circumferential seam, which is very unpleasant, because here comes partly by the white color of the shell. The fit is perfect, all the holes are where they should be, the cover is tight, but can be well removed. Not so successful is the contouring of side buttons: Both volume rocker, as well as on / off button are present on the envelope, but so minimal sublime that they are barely noticeable. In addition, they sit in the side (bad) seam, making it even more difficult to be felt. By relatively hard silicone keys are then also not good to use because wants to be pressed firmly.
The subject is a matter of taste, I need it so did not like was a "gift order" Miss daughter ... Her black Galaxy Core Plus the shell fits in any case better than the products image with the white ...
Four stars seem to me to be a good compromise between very good fit, poor workmanship and reasonable price. The longevity is of course still open ...