Personally, I just say: هاي البلاستيكة اللي بتلزق عل مراي or something similar. Not very convenient but I don't know of a name in Arabic and I don't really refer to it much so it didn't become a problem yet.
I was checking some Arabic e-commerce sites (while trying to avoid the Chinese ones with automatic translations to Arabic). I found that the piece is rendered:
حامل لاصق بطريقة الشفط