Laser Engravable Cut Heart Hole Necklace Blanks Gold Color / Rose Gold & Steel Silver . These blanks are made of 100% stainless steel, making them durable and corrosion resistant. They are tough enough to last through everyday wear and tear, providing an attractive and unique look. Laser Engravable Necklace Blanks. Their robust construction and smooth edges make them ideal for a variety of customization options, from laser engraving to sandblasting. Product Dimensions & Specifications: wide: 0.5 cm Length: 4.0 cm Material: Stainless Steel Mirror Polished. Chain Length: 44 cms (Adjustable to make smaller) Stainless steel is a brilliant alternative to sterling silver, it will not tarnish and is not plated. Its made using surgical steel grade stainless steel, which is less likely to cause allergies compared to other plated chains.