Medical-grade 304 stainless steel! Extreme temp retention (-20°C to 100°C) for 24H. Detachable tea strainer, BPA-free. Taste-safe design for coffee/tea lovers.24H Vacuum Insulated Tumbler - 316 Stainless Steel - Tea Infuser IncludedItem No.: HC-VB1145 Material: SS 304 Inner & SS 201 Outer Color: As shown in the diagram Capacity: 800 ml/1000 ml Contact Details: WhatsApp & E-mailE-mail: sales@hocentre.com ; E-mail: aileen@hocentre.com .