Black  Latex balloon 
Size available in 5",11",18" and 24"
Price varies on size and pieces
Sempertex or Betallatex Brand
5" won't float with helium
air fill with electric or balloon pump.
11",18"&24" Floats with helium
 
Shape: 5"&11" are teardrop shape
18"&24" are round shape.
 
Sold flat or Not inflated