HMH Flex Tubing Available in clear and 8 deadly translucent colors: chartreuse, fl. pink, orange, olive, blood red, root beer brown, purple, and black. Also NEW is slightly stiffer flex tubing in Neon Green and Neon Pink (See Below). Dual purpose flexible tubing: use as tubes or hook holder. 3/16" OD fits over 1/8" dia. tubes; 1/8" fits over 3/32" dia. and Micro tubes. 1/8" Flex Tubing nests perfectly with our Micro Tubing (see above). Available in single 12" piece.