Description_x000D_ General description_x000D_ Shigemi NMR microtubes offer high precision quality in NMR spectroscopy. The NMR microtubes are made out of a special type of hard glass wtih excellent chemical durability, and are magnetic susceptibility matched to each of the solvents they are identified with._x000D_ The Symmetrical NMR microtube consists of outer tube and insert with these features:_x000D_ • Magnetic susceptibility matched to a variety of solvents for the best resolution in these solvents using minimal amount of sample_x000D_ • The small sample size will not affect the spectral resolution or the sidebands_x000D_ • Each microtube assembly consists of an insert and an outer sample tube_x000D_ • Suitable for 900 MHz NMR instruments_x000D_ Choose a bottom length that most closely matches the probe coil.