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 Bionicle MOCs: Krana-possessed Matorans
BrickLink - Part 42042Vu : LEGO Bionicle Krana Mask Vu [BIONICLE] - BrickLink Reference Catalog
BrickLink - Part 42042Xa : LEGO Bionicle Krana Mask Xa [BIONICLE] - BrickLink Reference Catalog
LEGO BIONICLE: Lehvak (8564) | Compra online en eBay