Stainless steel will not contaminate soldering operations and is an excellent heat sink when soldering. Tips remain closed until you squeeze them open. Heat resistant fiber grips protect your hands from heat while soldering. Polished stainless steel tips firmly hold without contamination. Cross-lock mechanism opens when pressed to grip objects securely. A) CROSS BENT STRAIGHT WITHOUT FIBER B) CROSS BENT CURVED WITHOUT FIBER C) STRAIGHT WITH FIBER D) CURVED WITH FIBER