7522
For both materials , z-pinning increased the tensile strength and toughness in the z-direction by more than a factor of 3.5 .
 materials, z-pinning, tensile strength, toughness, z-direction
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:
 materials, z-pinning, tensile strength, toughness, z-direction