These aluminium rollers can be used to roll out many materials including silicon rubber, air hardening clays and modelling clays etc. Designed for high levels of applied pressure, these rollers are more universal than others and are more resistant to chemical attack than acrylic plastic rollers. They feature an easy-to-clean polypropylene handle, rigid frame, built-in rest and self-lubricating nylon bearings.um rollers can be used to roll out many materials including silicon rubber, air hardening clays and modelling clays etc.