This is a single Richell mug gasket P-1. I used one, but this one is unused. It's made of silicone rubber, heat-resistant up to 140°C and cold-resistant down to -20°C. It's a part for the baby try cup mug. - Compatible products: B1435, B1521A, B1521B, B1404 - Quantity: 1 piece only - Material: Silicone rubber - Heat resistance: 140°C - Cold resistance: -20°C It has been stored at home. Although it is unused, please understand that it has been in someone's possession.