Strong construction for better performance Yes4All Slam ball is specially designed to be thrown thousands of times without any break or deformation. Engineered for intensive repetitive exercises, Yes4All sand filled ball is made of durable PVC material, which allows the ball to absorb the energy of a Slam instead of bouncing or Rolling away. Clever design for effective fitness workout The uniquely textured shell provides a non-slip grip for you to catch the ball easier. Unlike others, Yes4All Slam ball features the seamless construction to prevent it from splitting over time of Use. This is a perfect ball for exercises like wall Slams, overhead throw, Russian twists & squats. Great tool for workouts, personal trainers, core strengthening, sport training like boxing, wrestling, & more. Why should you have a Slam ball? Improve muscle mass increase heart rate burn more calories enhance overall balance, coordination between hands & eyes Specifications different weights: 10, 15, 20, 25, 30, 40lbs Slam ball Super tough 9. 75” diameter shell for 10, 15, 20lbs options and 11” diameter shell for 25, 30, 40lbs options Heavy-duty textured shell for maximum durability Durable, sand-filled no-bounce ball is ideal for workouts & Slamming activities Perfect for total body exercise, core strength & explosive power movements information Yes4All is confident in our high-quality products, which is why we offer 1-year and 60-day return on the product, so you can feel confident in your purchase.