Plastic wheel things that stop chafe - name & where from?

That was quick! But I've not got a Force4 catalog to check that page! Could you let me know what they are called / or a part number etc / then I pop in there an ask for them? Thanks in advance.
 
One word of caution - where the sail runs over the wheel it will tend to stress the fabric and can actually cause more damage than without it.
 
Now found them. Thanks

Winsbury - thanks for the tip - but if the rollers work, it will be a big improvement on the current situation which has the head sail sliding over the staysail's hanks.
 
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