885
A moderate abrasive size at 12.5 μm and concentration level at 5 wt % resulted in the lowest final Ra ; as the two dominant material removal mechanisms – direct cavitation erosion and micro-abrasive impacts – were balanced .
 abrasive, as, material, cavitation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 abrasive, as, material, cavitation