Small box filled to the brim with test tubes. 

Amount
16 x 100 mm approx. 88-93 test tubes
16 x 150 mm approx. 70-75 test tubes
 
Amounts can vary as boxes are filled fully with test tubes and might deviate based on packing.

Specifications
16 x 100 mm
16 x 150 mm (mostly used, tube cube, mini outworlds V2, etc.)