Azek Square Aluminum baluster pack. Contains 20 pieces. Black color. 15 pieces are required for a single 6' rail kit; and 20 pieces are required for a single 8' rail kit. 29" balusters are required for rail with a 36" finished rail height. Compatible with Azek Premier and Azek Trademark rails. Also available are round Aluminum balusters, as well as composite balusters. Also available for stair rails.