Pro Tube Classic Some fly tiers want to create and cut their own tubes to desired lengths - and for them we have created the Pro tube classic, a wide range of extruded tubes in three carefully calculated dimensions. This allows the tier to tie tube flies in smaller sizes than ever before. Made in the best material available, and as a new twist to the game we added sparkle dots into the tube material. Pro Tube Classic 200mm 6 per package Pro Classic Small is 1.4mm O.D. Pro Classic Medium is 2.2mm O.D. Pro classic Large is 3.2 mm O.D. Pro Classic XL/ predator is 4.8mm O.D.