Fine Motor skills, Tactile
 
silicone liquid dropper is made of food grade silicone. 
There is no glue to connect the plastic pipette and the silicone tip. Easy to take apart and wash the droppers.
There is clear scale in the bottle body in each dropper and it is graduated as follows:1 ml, 2 ml, 3 ml, 4 ml, 5 ml.