N95s' are commerically made respirators designed for industrial applications. The letter part "N" represents its resistance to oil aerosols and the number part "95" represents its filtration efficiency percentage
There are three classes relative to oil resistance; N, R and P
N = not resistant to oil
R = resistant to oil (somewhat/partially resistant to oil)
P = oil proof (highly resistant to oil)
There are three classes of filtration efficiency; 95, 99 and 100
95 = will filter at least 94.7% of airborne particles 
99 = will filter at least 98.7% of airborne particles
100 = will filter at least 99.7% of airborne particles
The reason this is an important factor in industrial settings is because oil aerosols will quickly and effectively degrade the filtration efficiency of N type masks, with heavily concentrated oil aerosols also degrading R type masks.
Basically, unless you work within industrial settings with oil aerosols, the N, R and P has no bearing, making only 95, 99 and 100 of any relevance to you.
NOTICE: We apologize, as this page and website is incomplete, we will be added more information and data of relevance to these subject matters as we go in the coming days and weeks. With the nations extreme shortage in PPEs' and N95s' and so many without proper respirator protection, we have prioritize the manufacturing and distribution of our CF95 respirators to the public. Thank you for your understanding.