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It was found that 3DGP led to samples with higher density , hardness and surface finishing than those obtained by syringe extrusion , and that presented higher transverse rupture strength than others produced by gel casting .
 application: led; concept or principle: samples; machanical property: density; machanical property: hardness; manufacturing process: surface finishing; machine or equipment: syringe; manufacturing process: extrusion; machanical property: transverse rupture strength; manufacturing process: gel casting
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 application: led; concept or principle: samples; machanical property: density; machanical property: hardness; manufacturing process: surface finishing; machine or equipment: syringe; manufacturing process: extrusion; machanical property: transverse rupture strength; manufacturing process: gel casting