Look here :
www.neerhof.be/nl/producten/?c=RN
the first 3 are mesures 8 - 12 - 16 mm in 10 different colorations at prices 3,10 - 3,75 - 5,00 euro for 100 rings.
The green rings are numbered messure 8 mm from 1 to 25 = 3,00 euro.
These of messure 12 mm from 1 to 25 = 6,00 euro.
All rings are reusable and they send all over Europe.