Protein Shaker with the metal coil inside to help with mixing rather than just a piece of plastic on top. From the reviews on the D-S site it sounds pretty good as it doesn't leak like other shakers, plus it mixes really well. I bought one but have yet to use it.
The official D-S site is now selling them for £2.95 https://www.discount-supplements.co.uk/training-accessories-gym-optimum-health-coil-shaker-700ml-shaker
So £1.49 Delivered isn't bad at all for a good protein shaker. Can't even get the crappy ones from ebay at that price.