I bought this for my car, but it didn't suit me. I've lost the hex wrench, so please provide one. 【Breathable Design】 This cushion is made of mesh material, which is breathable and comfortable for long periods of use. 【Posture Correction Effect】 Designed to correct the pelvis and posture, supporting your health. 【Versatile】 Suitable for use in the office or at home, and can be easily used by simply placing it on a chair. - Color: Black - Material: Mesh - Purpose: Posture correction - Shape: Cushion - Features: Breathable design Thank you for viewing.