All Rob Allen rubber is manufactured by Dip processing. While costing more this enables fewer additives to be used, enhancing performance on a gun. The coloured outer layer increase protection from the environment and the amber inner core is purer for performance.

Available in 16, 18 and 20mm diameters, 16mm for lighter spears and double rubber guns, while 20mm rubber is ideal for longer single rubber guns with heavy spears.