What refills are compatible with PILOT Dr. Grip Ballpoint? For the standard Dr. Grip, you can refill and continue enjoying your PILOT writing experience with an RFNS-GG Refill.For the Advanced range of Dr Grip, such as Dr. Grip Advance, Dr. Grip Pure White and Dr. Grip: BRFN-10.Dr Grip 4 + 1 uses BVRF-6F.