A spiker roller having (i) a roller assembly (10) having a plurality of roller components (11) each having a peripheral wall and a plurality of apertures in each wall and a centrally located hub or boss (15) surrounding an opening； (ii) a multiplicity of spikes (18) which are each releasably retained within a respective aperture of each roller component； and (iii) a support shaft (12) which is insertable through each of the openings of each roller component. In operation the roller components rotate independently of each other.
