Don't tell baby that they are only 1.5 ounces. Edushape's Edu-Weights look like barbells, but are really rattle/shakers designed to stimulate babies and encourage development of their fine/gross motor skills, hand-eye coordination, auditory sensory stimulation and visual stimulation. Specifically designed with high contrast colors, pattern and different textures. For ages 3 months and up. Launch date: June 2012.