The speed bag is an essential training tool for increasing strength, hand speed, reaction time and hand-eye coordination. This one from has been made from durable leather with double stitched seams along with double-layering on the bottom of the striking area. For a quicker rebound effect it features a lightweight latex bladder. SB-1 Rebound Speed Bag Durable leather Lightweight latex bladder Size Large: 6" x 9" Please note standard lead time for this product is 1-2 weeks