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Un bolígrafo simplificado, caracterizado por que su caperuza externa posterior presenta una prolongación inferior que va roscada en el interior de la envolvente; por que esta prolongación presenta a partir de su base inferior dos cortes diametralmente opuestos, en forma de cuña, con lo que forma dos brazos elásticos que amordazan y cubren la parte superior del tubo depósito de la tinta grasa solidarizándose así ambos elementos, caperuza y tubo depósito; y por que el interior de la puntera de la envolvente es troncocónica para servir de guía y sujeción a la punta escritora del bolígrafo.