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Each order/quantity is sold in packs of three 1½” (39mm) pieces. Your heatshrink is normally going to be your finishing touch on your connection.
The heatshrink used has a shrink ratio of 3:1
We currently offer two different diameter sizes, in 3/8" and 1/2". We recommend using 1/2" for you USB Type-A as the shell is slightly bigger and you might have to stretch the 3/8". The 3/8" will size up to a number of things and its more versatile and clean when shrunken. If you're looking to use heatshrink for a TRRS connection you may want to use 1/4".
Regarding bulk purchases/custom lengths(for example: full lengths over our 1½” cuts), we'll be happy to fulfill those special requests. Just go over to our Contact Us page and give us a shout!