This 0.5mm/0.7mm refill is compatible with the Frixion ball (Frixion clicker). The barrel is thick compare to LFBTRF-12EF.
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Frixion ball refill - Pilot Pen Malaysia
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Frixion Point Knock Refill - Pilot Pen Malaysia
Pilot FriXion Ball Refill - 0.5 mm - Black
12 pcs PILOT FRIXION ERASABLE BALL POINT GEL PEN REFILL Blue 0.7mm (Fine) -Japan