Retail price: 13,500 yen This necklace is no longer sold and is difficult to obtain. phiten Necklace RAKUWA Neck X100 Pendant Top Product Description The plate is interchangeable and has a black and silver double-sided design. It's a 3-way type that allows you to remove the plate depending on your needs. Technology: Aqua-Titanium X100, Micro-Titanium Ball. Color: Black. Aqua-Titanium X100 X100 is a technology that impregnates with Aqua-Titanium at 100 times the normal concentration.