The original Meyer Dice Tube (Version 1) had its spiraling helix formed using 1/8" black cast acrylic round rods. The 11 rods were vertically spaced 1/2" apart, on center, and were progressively angled at 25-degree intervals.
The improved Meyer Dice Tube (Version 2) has its spiraling helix formed using a single length of "surgical-grade" latex tubing which is "laced" through 26 drilled holes to form 13 "rods" which run through the center of the tube. The 13 "rods" are progressively angled at 30-degree intervals (twelve 30-degree intervals from the first "rod" yields exactly 360 degrees, one complete rotation).
Almost everyone who purchased Version 1 was very pleased with the product. Of the hundreds of customers, only 9 people contacted me with ideas for potential improvements.