PFM IV 和V的尾钮是包金贴片,不是黄铜,penhero的文章这样写道: PFM IV - Stainless steel cap and plastic barrel, gold filled clip and plunger cap end plate, and 14kt gold nib. PFM V - Gold plated cap and plastic barrel, gold filled clip and plunger cap end plate, and 14kt gold nib。