Rarity level 8/10❗️Authentic LEGO Bionicle exclusive White metal Krana Kal promo piece, also called WMKK. They're almost impossible to find these days and only 5000 have been produced + around 100 spares! :
Lego Copper Bionicle Krana Mask you pick mask by letter | eBay
LEGO Bionicle Krana & Kanohi Masks Set 8569 - TW
LEGO BIONICLE: Krana (8559) for sale online | eBay