Zojirushi silicone gasket, compatible with SM-K models. - Brand: Zojirushi - Model Number: BB402019M-00 - Material: Silicone rubber - Compatible Models: SM-K series Thank you for viewing. After purchase and opening, I washed it lightly and realized it was the wrong item. It has not been used as a water bottle. The item will be sent directly in an envelope via standard mail.