It is a zoysia japonica. I'm guessing El Toro is the cultivar.
Based on the pics it is evident that you are mowing with a rotary. The grass tips are literally shredded instead of being cut. If cutting a zoysia lawn with a rotary, you should plan on sharpening your blades(s) at least once a month. It only takes a few minutes to do if you are handy with an angle grinder.