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The parts obtained at high and low scanning speeds show higher hardness and lower wear rate than those obtained for intermediate scanning speed which , on the contrary , show the highest density .
 scanning speeds, hardness, wear, scanning speed, density
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:
 scanning speeds, hardness, wear, scanning speed, density