The law of averages would suggest that the vast majority of small balls would be stopped by the cage but not all of them. The mesh on Cimarron batting cages is 1 3/4" while a JUGS small ball has a diameter of 1.59", meaning there is a very real chance that some balls could fly through the mesh without even nicking the netting.
The only type of Cimarron Sports netting that will stop a small ball is golf netting, which makes sense since small balls are the size of golf balls.
Although not as sturdy as a steel batting cage, a Heater Xtender cage will stop all JUGS small balls because Xtender cages have 1" mesh netting.