The black portion of this product is made with thermochromic paint, which changes color from black to green as the temperature rises.

Size:?
Silver 1 & Black (JZ023-012S &?JZ023-012S) inner diameter: 14.5mm.
sleeve: 70mm?

Silver 2 (JZ023-013) inner diameter: 15.2mm?
sleeve: 58mm

Material: 316 steel, zircon
Collection: BLACK GLOVES
Package: Jewelry box*1, Jewelry pouch*1