https://sp-wilmadlabglass.com/product/10-mm-red-nmr-tube-cap-100-pk/
10 mm Red NMR Tube Cap, 100/Pk - SP Wilmad
NMR/EPR Tube Caps - DisposableDisposable NMR Tube Caps are manufactured from molded PVC or Polyethylene depending on the tube OD. The different colors help...
nmr tube capmmredpksp