Xencelabs Pen Tablet Small review: The more affordable rival to Wacom's Intuos Pro: Digital Photography Review
Amazon.com: Wacom KP504E Pro Pen 2 with Case, black : Electronics
Amazon.co.jp: Pro Pen 2 KP-504E for Wacom Intuos Pro CintiqProペン ディスプレイ8192圧力レベル Wacom Intuos用オプションペン 標準ペン 筆圧8192レベル対応 KP-504E : パソコン・周辺機器
Wacom on Twitter: "@AktasZulfikar Thank you for reaching! These pens are compatible with the Intuos2: XP110 Intuos2 Inking Pen XP120 Intuos2 Stroke Pen XP300E Intuos2 Classic Pen XP400E Intuos2 Airbrush Pen XP501A
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Amazon.com: Wacom KP504E Pro Pen 2 with Case, black : Electronics