Tubing, Two Color, Bag of 100

These are bags of 100 two color tubing. This tubing is used to represent the most commonly used bonds for Organic Chemistry. Refer to the attached photo for their exact colors.  We allow mixing parts so please specify how many of each two color tubers you need.

Carbon to Hydrogen (C-H)     Black on White
Carbon to Oxygen (C-O)        Black on Red
Carbon to Nitrogen (C-N)       Black on Blue
Oxygen to Hydrogen (O-H)     Red on White
Nitrogen to Hydrogen (N-H)    Blue on White