These twist pens utilize a Cross-style refill, which is widely available. Because this style refill is thinner than a Parker-style refill, these pens tend to be thinner in their design.
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Slimline Twist Pen - Cocobolo body with titanium gold trim (#1149)
$49
Slimline Twist Pen - Cocobolo body with chromium trim (#1153)
$49
Slimline Twist Pen - Brown Corian body with platinum trim (#1117)