The Hex Bumper’s design eliminates many of the disadvantages of traditional round bumpers and holds up to the daily routines of pro trainers! It has 6 flat sides with raised V-Grips for the soft mouth with superior hold. A firmer feel helps reduce any chomping tendency. 2″ x 10″ size works for training large dogs but is suitable for small dogs to retrieve as well. The Valveless design never takes on water. Superior construction makes this bumper durable and long-lasting. Throw rope included.