Stelt insulating vacuum non-leaking tumbler The Stelt insulating vacuum not leaking tumbler is a tumbler which is made both inside and outside of stainless steel. The tumbler is vacuum insulated, this way of insulation is best to keep your drinks warm. The tumbler has a capacity of 400ml. The tumbler has a non-leaking screw cap with a spout of silicone. Stilt tumbler is available in three colors. You can print the Tumbler Set your own design or logo. You can print your design or logo in up to 4 colors. Also, you can engrave your logo. The Tumbler Set is BPA-free production.