If you want custom engraving, 

FADE RESISTANT AND WATERPROOF
THE PERFECT GIFT FOR HIM OR HER
DESIGNER QUALITY WITHOUT THE DESIGNER PRICE

Sizes: The necklaces comes with a 55cm chain, but the chain can be changed to other lengths. you can purchase extra chains in 65cm and 55cm here:

Material: 

Gold Finish - 18K Gold Dipped
Silver Finish - Durable, Mirror finish 316L stainless steel
Matte Black Finish- Coated in Ceramic Matte Black
Rose Gold Finish - 18K Rose Gold Dipped