Common Fill Materials
PSE - Triangular shaped polyethylene is extremely soft, yet highly durable
PEX - "x" shaped polyethylene. soft and gentle, but slightly stiffer than PSE. Stands up to hard use and has excellent water retention.
POLY - Oval shaped polypropylene. Excellent abrasion resistance for long life. Retains wet stiffness better than other filaments. Very aggressive brushing action.
PSO - Triangular shaped polypropylene. Same excellent qualities as oval polypropylene but slightly softer with better waer retention.
Nylon - Rugged aggressive brushing action. Longest life and best bend recovery of all synthetic filaments.
Horsehair/PSE Mix - A mixture of 50 % stiff black horsehair and 50 % PSE. Highly absorbent, natural bristles combine to give excellent polishing, drying and waxing applications.
Horsehair - 100% stiff black horsehair used in similar applications to horsehair/PSE mix. Softest bristle available but with less " Body" to stand up to prolonged hard use.