Our seed bombs are hand made using recycled paper. They are made with a blend of wildflower seeds that get mixed into the paper making process as we roll each little ball out by hand. Our seed bombs measure approximately ¾- 1 inch in diameter. Please view photos with a quarter for size comparison. As they are all hand-made, please allow for variances in size and shape. Seeds used are a blend of annuals and perennials using the following North American wildflower seed blend Catchfly, Northern Light Toadflax, Red Prairie Coneflower, Sweet Alyssum, White Yarrow, and Shirley Poppy. We do recommend planting within 12-18 months Comes with 20 business card size planting instructions