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It was demonstrated that of the fibres investigated , those fabricated using carbon fibre yielded the largest increase in mechanical strength per fibre volume .
 fibres, fabricated, carbon fibre, mechanical strength, fibre
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:
 fibres, fabricated, carbon fibre, mechanical strength, fibre