If, by BCA, you mean BCAPL:
Phenolic tip illegal for use on a break shot. Type of stick it is on is not relevant.
White diamond - not legal for break shot. Entire surface of the tip designed to contact the cue ball must be 100% leather (exposed glue between layers of a layered tip OK).
Phenolic legal for all other shots except break.
Applicable BCAPL Rule is BCAPL Equipment Specification 9(d).
BCAPL National Head Referee
BCAPL Director of Referee Training
Technical Editor, BCAPL Rule Book
Find the Official Rules of the BCA Pool League here:
* The contents of this post refer to BCA Pool League (BCAPL) Rules only. The BCAPL National Office has authorized me to act in an official capacity regarding questions about BCAPL Rules matters in public forums.
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