Rabbis in Israel are warning shofar blowers to avoid cheap imports from Morocco and China.

The Tel Aviv Religious Council’s Ritual Object department has called on the general public not to use shofars made in these two countries.

Moroccan shofars, which have been increasingly seen in the past year, tend to be glued with polyester, making them unsuitable. And as for the Chinese ones, they are even worse — some are said to be smeared with pig fat.

Looks like Israelis will need to swap them for kosher shofars if they are not to hit the wrong note over Rosh Hashanah.