Sorry, but you've lost me.
The reason I posted it, its acrylic not glass or whatever your test tube is made of, they also make patterned pins.
SORRY BOB
My first point was simply that (being a tight wad) I'm always aware of the prices charged for hobby items when lower cost and perfectly acceptable alternatives exist.
As far as a 'rolling pin' is concerned, I simply noted that any suitable round rod or rigid tube will work (I've used copper pipe off-cuts, old-style milk bottles, bits of dowel and a lino cutting inking roller as well as both glass and plastic test tubes... or as Paul says, a spray can). So why pay £11.06 + £3.43 UK p&p for a 32cm length* of acrylic available at lower prices elsewhere (eg
here). Also bespoke hobby rolling pins, eg
here,
here and
here ... pretty sure all would work just as well).
*not 30cm as noted- that bit was rude
The textured
rollers and
mats do have added value but the mats do seem quite expensive for what they are.
One thing I've learned is to hang on to any interestingly shaped, profiled or textured item as you never know when you might come in handy when modelling/sculpting
My second point was in response to your 'swmbo' which I took as a reference to
John Mortimer's Rumpole of The Bailey character and his use of
'she who must be obeyed' (itself a ref to H Rider Haggard's book
She) with reference to his wife.
My flight of fancy in today's C19 lock-down was alluding to him being stuck at home (Froxbury Mansions) listening to Hilda (swmbo) wittering on about how Rumpole (she never uses his actual name) doesn't measure up to her 'daddy' (C H Wystan QC) when he can't even get out to Pomeroy's (his habitual winebar) for a glass, or bottle, of Chateaux Fleet Street (cheap claret) when even The Old Bull (an old courtroom adversary, Hon. Judge Rodger Bullingham) would have let him out on bail.
... as they say, if you have to explain a joke it ain't funny 
