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These square section translucent plastic tubes are labelled in blue with the Society's name and website. They have a ribbed inner which allows them to adjust from approx 137mm to 237mm. The inner section is minimum 17mm across and outer is 19 mm. They will hold a pen the size of a Conway Stewart 74 comfortably but a larger pen such as a Parker Duofold Senior Flat Top (1927) will only just slide into the outer part. For larger pens, see the listing for LARGE tubes. One of the images shows both tube sizes.
It is a good idea to put a piece of cotton wadding or tissue into the ends for the pen to be protected and then close the container down to hold it without rattling.
Note that this smaller tube will fit with a simple padded envelope in the UK Royal Mail Large Letter postal rate. The larger tube will not.