Assertion: cleat's surface | /r/HasProperty | involved in either the engagement
Facets:
Source sentences:
text: The general principle here is that at least one (if not both) of the two frictional contacting surfaces involved in either the engagement or the release of the cleat and pedal assemblies is made of a material that has a measure of hardness that is greater than hardened steel (e.g., a Mohs hardness of greater than 7.0), preferably a non-metal or a carbide, preferably selected from the group consisting of silicon carbide, boron carbide, tungsten carbide and titanium carbide.