... of first grade natural rubber hot water bottle, resistant to boiling water, 100% leak proof . Nice quality BS1970:2006 . BS HOT WATER BOTTLE WITH KNITTED COVER1. Size ... : 2000ml, 1500ml, 1000ml, 750ml, 600ml, 500ml2. Material of knitted : Acrylic , wool etc.3.Design of cover ... outer CTN: 50PCSOuter CTN size: 45*37*28cm BS HOT WATER BOTTLE WITH KNITTED COVER