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Supplied Internal Diameter---3mm Size 20pcs each of 2 Colors---- Black, Red Total 40pcs 2:1 Heat Shrink Ratio These heat shrink tubing will shrink up to 1/2 of its original size, providing a firm wrapping for the materials. Only use a lighter heating if the tube is small, or hair dryer heating for large one. The 100pcs heat shrink tubing contains 3mm size to meet with different uses such as home projects, automotive and any application you want to use. The heat shrink tubing is carried with a storage case which can be semi-open or fully opened and it is so convenient for you in wrapping project and sweeping Note: You should keep about 1 cm distance when you use the lighter to shrink the tube, because it is easy to leave a black mark