Super durable PVC shell is designed to last. Exclusive thick inner foam core gives bag shape and rigidity while adding cushioning 8 separate handles for all workout grip configurations, including angled handles. Thick solid core rubber handles provide excellent grip and comfort Included 10lb, 15lb & 20lb portable sand kettlebells fit snuggly inside. Kettlebells can be easily removed for separate freeweight exercises Hundreds of possible exercises including curls, presses, squats and more! Also ideal for a circuit and cardio conditioning. Patent-Pending Design. Inner Sand Fill Lines for easy filling to exact weight. *DOES NOT COME WITH SAND*