These blocks are engineered for ultimate high temperature performance. Made from a high temperature copper-alloy with a softening point of well above 500C (compared to aluminium blocks which begin to lose integrity beyond 350°C), and much-increased thermal conductivity these copper blocks are perfect for high temperature applications while working perfectly with everyday filaments like PLA, and ABS . In addition to high temperature performance these blocks are plated, this plating reduces the adhesion of plastic to the block.