【Frozen Ice Ring Deluxe】 This cool ring solidifies when the temperature drops below 28°C. Simply wearing it around your neck provides a cooling effect. This deluxe version uses approximately three times (350g) the PCM (Phase Change Material) of the standard model, resulting in longer-lasting coolness. It can be reused by chilling it in the refrigerator. Refrigerator: Approximately 90 minutes / Freezer: Approximately 60 minutes Price negotiations are welcome. Color: Blue Size: Outer diameter approx. 18.5 x 21.5 cm, inner circumference approx. 41.5 cm Weight: Approx. 350g