Sold by per pack of 2pcs. The round opening of each hollow glass measures about 4mm in diameter.

  
   		  Sphere 

16mm : $1.80 /pack
18mm : $2.00 /pack
20mm : $2.20 /pack

                
 		  Cube 

Size: 20mm x 20mm
Height: 11mm

$2.70 /pack
 

 Hemisphere 

Diameter: 20mm
Height: 12mm

$2.70 /pack

                   Flat round 

Diameter: 22mm
Height: 6mm

$2.70 /pack