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Kubotan is a genericized trademark for a self-defense keychain weapon developed by Sōke Takayuki Kubota in the late 1960s. It is typically no more than 140 millimetres (5+1⁄2 inches) long and about 13 mm (1⁄2 in) in diameter, slightly thicker or the same size as a marker pen. The material is usually a hard high-impact plastic such as Lexan. The body of the Kubotan is lined with six round grooves with a screw eye or swivel and split ring attachment at one end for keys.