Anti-Slip Plastic Handle Grip
It is a common grip material which can easily be found on cameras and guns. The bumpy pattern provides the anti-slip characteristic.

The colour, colour variation, bump height can be managed via the Substance SBSAR file.
 
Diamond Shaped Gun Handle Grip
It is the surface texture of a typical gun handle grip having diamond shaped bumps to increase fiction.

The color of the gun can be changed through the Adobe Substance SBSAR file.