Quantity: 1 piece. Color: Black Material: Plastic and Sponge Headrest pillow size: 26cm x 15 cm/10.24" x 5.9"(L x W) Hole centere distance: 7 cm/2.75" Mounting slot length: 10.6cm/4.17" Feature: Comfortable, sturdy, durable for long-time use, provides support for your head and neck. The height of the headrest can be effortlessly adjusted from 6 inches to 7.5 inches, the angle of the headrest can be easily adjusted up and down. How to install: Simply align the card slot with your chair and tighten the screws to securely attach it. Application: with most of backrest, such as wood or plastic Note: All dimensions are measured manually and there may be small deviations. The package contained: 1 piece of black adjustable office chair headrest Size: Headrest pillow: 26 cm x 15 cm/ 10.24" x 5.9"(L x W); hole centere distance: 7 cm/ 2.75"; mounting base length: 10.6 cm/ 4.17" Reliable quality: The head rest for chair is made of plastic and sponge with black breathable mesh, is comfortable, sturdy, provides support for your head and neck Practical headrest: The height of the headrest can be effortlessly adjusted from 6 inches to 7.5 inches, the angle of the headrest can be easily adjusted up and down, which is with most of backrest, such as wood or plastic Easy to install: Simply align the card slot with your chair and tighten the screws to securely attach it