These weights are perfect for resistance training or rehabilitation from injury. Elmer's has been a leader in the manufacturing of quality products in the USA for over 35 years. These weights are made of top quality foam backed expanded vinyl, and are available in a wide variety of sizes from 1/2 to 20 pounds. They have 18" to 22" long genuine VELCRO????? straps and heavy duty grommets. Each weight is labeled and color coded for easy identification. All Elmer's Weights have a one year warranty against defects in workmanship and materials. Standard weights are constructed of 28 gauge vinyl with foam backing, and are double stitched with a straight stitch. Weights 1 lb.- 5 lbs. have one grommet. Weights 7 -1/2 lbs. to 15 lbs. have two grommets.