finger cot; rubber finger tip; finger stall
A small rubber or latex cover worn on a finger for protection or grip, commonly used in office work, sorting papers, or light industrial tasks.
It's convenient to use a finger cot when flipping through documents.
I put on a finger cot and handle small parts.
Compound of 指 (yubi, 'finger') and サック (sakku), from English 'sack' or possibly influenced by 'finger sack'. The exact derivation is uncertain, but it refers to a finger cover.