Esterbrook Esties Tortoise is a 30s tribute, a rollerball pen with a clean and vintage-inspired design. Tortoise is a translucent brown resin with a balanced blend of browns and tans. Tortoise color reminds us back to the popular acrylic blend from the 30s and 40s. The tortoise color has the elegance of yesteryear while still very much being a modern pen. Manufactured from premium turned acrylic the Estie Tortoise has a pleasing weight and satisfying presence in the hand. The Estie rollerball pen is a joy to use. Presented in a quintessential amber brown tortoiseshell with gold plated trim, this Estie rollerball pen has a traditional and distinguished aesthetic.