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The filling system called ''safety filler'' was born as an evolution of the [[dropper loading]] system. To simplify the filling operations without having to disassemble and store the section with the nib unit, and to avoid ink leakage as a result of differences in pressure and temperature, in this case the nib is mounted on a mechanism that allows you to retract it inside the body of the pen. From this feature comes also the name of ''reentrant'' with which we often identify the pens that use this filling system.

The filling system called ''safety filler'' was born as an evolution of the [[eyedropper filler]] system. To simplify the filling operations without having to disassemble and store the section with the nib unit, and to avoid ink leakage as a result of differences in pressure and temperature, in this case the nib is mounted on a mechanism that allows you to retract it inside the body of the pen. From this feature comes also the name of ''retractable'' with which we often identify the pens that use this filling system.

[[Image:SafetySchema.svg|center|500px|Diagram of a [[Safety]] pen]]

[[Image:SafetySchema.svg|center|500px|Diagram of a [[Safety]] pen]]