PURPOSE: To provide a media with sufficient untwine, decoloration and soft finish by furnishing plastic grains each formed into a specific size with a number of pores at its surface zone, sinking the virtual specific gravity below one, and thereby relieving shocks to be applied to fibers.

CONSTITUTION: To manufacture plastic grains, mix 20W50wt% of unsaturated polyester resin with 30W10wt% of vinyl chloride resin, followed by well agitation. A mix of 49W30wt% of silica and 1W10wt% of foaming styrol resin is added to the above to be followed by well agitation, then the admixture is cast and dried at 200W250°C. After getting rid of the die, the product is provided with a number of air holes 1 inside and at the surface to form a porous resin media 3 having a virtual specific gravity of no more than one to be used for processing a barrel. According to this arrangement the media has an extraordinary soft touch with cloths, assuring very good finish with fine skin feeling. As the surface is as rough as that of a pumice, it has a good effect for untwine and decoloration.