Come and Check Our Promo Solutions.DIBIKOU hot water bottle is made of new anti-aging rubber, longer life than traditional ordinary rubber bottles. Make sure maximum safety and transfer the heat perfectly. Passed pneumatic pressure test, 24 hour swing test. It is completely pressure-tolerant and leak proof.The basic function of hot water bottle is to keep warm. DIBIKOU hot water bottles are made from 100% natural rubber, which helps maintain liquid temperature and hold the heat longer than traditional silicone hot water bottle. Pls check inventory and detailed info with us before placing your orders.