It's a little over 12.5cm by 10cm. Its in Shetland supreme yarn which knits to a similiar gauge to Zephyr
At this size the estimate for the overall SSS size is approx 65cm wide.
Finally I was prescibed a dose of spinning ... just 10mins per night for the last 3 weeks. Here is the resulting single (merino). I managed to break the drive band on my wheel last night (it was overall a REALLY bad day) so need to fix before I can spin up the second bobbin and then ply.
Just realised I forgot to take pictures of thistle ...