Materials: Hand-knit with 100% cotton yarn and a poly fill. Size: 5" (L) x 3" (W) Machine Washable: For best results, place your Pebble toy in mesh bag and launder with cool water and non-toxic detergent. Fluff in dryer for a few minutes and then air dry. Design Philosophy: Made with child development in mind. Colors, textures and shape spark tactile, auditory and visual stimulation. Slight color variations make each piece truly one-of-a-kind.