Sushezi is an invention by Hydraflow Industries in New Zealand that slowly plunges rice and filling out of tube in a perfect cylinder for making rolled sushi. The Sushezi can be purchased at Strapya World or directly from Hydraflow on its own or as a kit with a storage bag and a slicing guide.
Instructions on how to use the Sushezi can be found on their website or in a handy video demonstration:
Rolling sushi the traditional way with a bamboo mat appears to go a bit faster, however:
images via Strapya World