Rules state what is allowed so if not stated in the rules, then
it is not allowed.
There can be no markings on the string or bow that would help the archer aim.
No electronics or anything electric.
Sights can not be magnified.
Finger tabs can't have anything that would help the archer draw or release the string.
Unlike the barebow the Archer is allowed to use a sight and stabilisers, the rods attached to the bow, that steady the bow helping the archer to stay on the target.
These rules are to keep the focus on technique.