This will be a nice assortment of soft and hardwood natural wood slices. They will all be approximately 3/8 thick, and measure anywhere from 1 1/2" to 3 1/2" in diameter. They will have a 5/16" lacing hole that is perfect for leather, poly rope, and smaller cotton. With it being mixed up like this you get more of a variety for your birds. Very popular item right now!