Alox (Aluminium Oxide) is the most common type of abrasive. It is an excellent starting point for most applications. It is the ideal solution when you want the ability to resist fracturing and medium aggressiveness. It is durable, with resistant cutting edges, showing continuous wear.
The indicated grits are the most common for the operations in question, but they do not exhaust all available alternatives. We will be happy to help you find the best solution for your case.
In addition to the sponges listed, there are several variants that may be more suitable for your purposes. OTA will be happy to present them to you.