Presenting the TPW Stainless Steel Shaker. Our most durable shaker to date, each one is crafted from 100% solid, stainless steel so it can withstand anything you can throw at it or in it. We say they’re gym proof, others say they’re bullet proof, but one thing’s for sure the contents of your shake are most definitely safe and secure. The TPW Stainless Steel Shaker is basically an armoured version of our hugely popular TPW Shaker. Hard and durable it can be used anywhere without fear of breaking or leaking, contains 25 fl oz (739ml) of liquid and has a flip open lid which helps prevent any leakages in your gym bag.