[Marwan]

great catch sanad,
i recommend you keep the 18mm bands, but move up to a 6.75mm spring steel shaft (riffe and omer makes hem)instead of the 6.5mm, you will be amazed at the results..slightly heavier has a lot more punch and is stil light enough to be a very fast spear, you cold also use them with 20mm but i found no need to so far...