These soft, weighted balls serve many purposes from a therapy point of view. Made from a soft, durable outer shell with filler, these balls are easy to hold and do not bounce or roll away when dropped. Use them to strengthen muscles, develop balance, and to give deep pressure/proprioceptive input for children who need this type of sensory input. A good option to dumbbells. Available in .5kg (yellow) and 1.0kg (green). Both are 13cm diameter.