Maybe, DO NOT consistantly train them...
How often do you train your arms? Your bi's and tri's are small muscles and should NOT be trained too much...There is a such thing as overtraining any body part...
Try doing tri's and bi's once a week ... I no longer train my arms by themselves...I do BI's with Shoulders (Sometimes chest if tired), and Tri's with back...A total of no more than 10 reps, no less than 3 exercises...(17.5 arms) ...
Bottom line is that your arms are in constant use every time you workout, shoulders, chest, back...Training too much will only have a reverse affect...They'll never grow!