Answer:

ebonite

Answer	Crossword Clue
EBONITE	Bowling ball material
EBONITE	Hard black rubber
EBONITE	Vulcanized rubber

EBONITE	Inelastic rubber
EBONITE	Common bowling ball material
EBONITE	Hard rubber
EBONITE	Comb material
EBONITE	Black hard rubber.
EBONITE	Hard rubber.
EBONITE	Vulcanite.
EBONITE	Bowling balls are made of it.

EBONITE	Black variety of hard rubber.
EBONITE	Hard black stone.
EBONITE	Rubber for combs and buttons.
EBONITE	Combs are made of it.
EBONITE	Hard black rubber.
EBONITE	Hard back rubber.
EBONITE	Hard rubber substance
EBONITE	Electrical insulation material

EBONITE	Comb rubber