Bought these to replace the stock Maxxis tubes on my Charge Cooker Maxi 1 which at 450g per tube (3.8-5.8") were a tad heavy. Stock tyres are 4" Maxxis Mammoth on 80mm wide 26" rims FYI.
I weighed the Schwalbes at 375g each so an easy & cheap saving + rotational weight even better.