1. Double wall 18/8 stainless steel. 2. Keep hot in 10 hours,keep cold in 24 hours. 3. Dishwasher safe for easy cleaning. 4. BPA-free ,healthy to your life. 5. Outdoors :Climbing, camping, picnic etc. Item No:RK569. Type:Stainless steel tumbler. Capacity:350/450ml. Material:304 stianless steel body with Aluminum carabiner. Logo:Silk printing.Heat transfer printing.Laser engrave.etc. Color:Black, Silver, White or customized. Factory Audit:BSCI/ISO90001/SEDEX/DISNEY/LVMH.etc. Certification:LFGB/FDA/CA 65/BPA free. Packing:Egg creat/white box/color box/CDU. Sample:Stock sample free,can send out within 1-2days. Delivery time:30-45 days after order confirmation. MOQ:3000PCS.Stainless Steel Tumbler website:http://www.ykrayko.com/stainless-steel-tumbler/