Reliable: The rotating pen has a symmetrical design, the pen tip is made of TPR soft rubber, the pen body is made of ABS material, and the dynamic balance support ring is made of aluminum alloy, which is reliable and strong and can be used for a long time. More stable: This rotating pen is about 21.6 cm / 8.5 inches long, enough for you to use; stainless steel balls are embedded in both ends of the pen to achieve a balanced weight, so you can easily twist the pen. Decompression toy: This rotating pen is suitable for children and adults; you can use this pen to train your hands, eyes, thereby improving your concentration, memory and learning ability; it can also help you relieve work and life pressure. Best gifts for gifts: You can give these game finger pens as gifts to friends, relatives, colleagues and classmates on Thanksgiving, Christmas, New Year, birthday and other holidays to express your love and care. Note: This product is a Spinning pen, excluding refills. If you add the refill yourself, you will lose balance when twisting the pen. It is recommended not to add refills, thank you type: A color: black + silver Material: ABS + aluminum alloy + TPR Package contents: 4 x Spinning pens (2 colors for each) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.