26mm inner diameter
30mm outer diameter 
2.65-2.85mm track offset 
Deep/wide track to accommodate up to 8.5mm shaft diameter 
Filled with a resin impregnated foam to prevent leaks, dampen sound, and decrease recoil. 
130cm length can be cut down to whatever length you desire
Ideal for building a single or inverted roller
*Other colors including: white, green, pink, dark blue, gold weave, red weave, blue weave; can be preordered