1[Special Ink Technology] The pen refill uses special ink that fades away within 30 minutes after writing, allowing for repeated use of the practice copybook. 2[Pen Grip Helper] The practice copybook includes a pen grip to assist in correct grip positioning for improved handwriting skills. 3[Thickened Beige Paper] The thick beige paper prevents ink from seeping through, resists tearing and curling, and reduces eye strain for kids during writing practice. 4[Spiral Binding] The practice copybook features spiral binding that lays flat, making it easy for kids to flip through and fold pages for convenient writing practice. 5[Rich Content] The handwriting practice book is double sided with engaging content including letters, numbers, and images to catch kids attention and cultivate their interest in learning. 4 xPractice Copybook 1 x Pen Holder 10 x Pen Refills 1 x Pen Grip