Answer:

horsehair

Answer	Crossword Clue
HORSEHAIR	Violin bow material
HORSEHAIR	Paintbrush material
HORSEHAIR	Upholstery fabric.

HORSEHAIR	Old-style furniture fabric.
HORSEHAIR	Brush material
HORSEHAIR	Bowstring material

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.