Hi Fred,
The entire surface is the 18" ultra tiles and it does not get slippery when wet. The only difference in the border and center is the color. The tool box at the back of the garage was rolled there across the tile.
In my other garage I have a four post lift sitting on the tiles with no visible impact on the tiles. It is a great product and the problems I had were related to the installation and that the person I bought it from went out of business and did not follow up on any warranty/repair issues. When the corporate organization learned of my issues they took care of me.
The two garages face each other acroos the front of my home. Here is a picture of my other garage with the black/white checkerboard floor, I have had no problems with this floor.
Best Regards,
Tony R.