Similar to Critical Defense, but not quite the same. The Critical Defense have a red material with a slightly round tip in the end of the FTX bullet. The Zombie Max has a white material with a fairly flat tip in the end of the Z-Max bullet. Not sure what the difference is between the materials. Their published ballistic info is very similar. The Critical Defense has a nickel plated casing vs plain brass for the Zombie Max.
All the different caliber Zombie Max rds I have come with a green material tip, that's how I recognized thepunk88's.
Both the Critical Defense and Zombie Max tips are polymer, just one red, one neon green.