The Alpha Linkable Designer Stacking Chair by Harmony Collection is heavy duty with a maximum weight capacity of 250 pounds. They are perfect for outfitting a classroom, auditorium or for meeting and conference rooms. You can also link these armless guest chairs together by using the sturdy locking clips located at the bottom of the base. These plastic stackable chairs have a black fabric seat on a chrome metal frame with a hard black plastic back and can be stacked twelve high.