Plastic-coated aluminum flower support rings are perfect for yarrow, foxgloves, mums, tall sedums and more. Rings can be adjusted up and down as plants grow. Ring diameter is 10-12\". Ideal supports for clumping perennials and annuals Dark green color blends with foliage Set of 3 supports We also offer Tall Support Rings Plastic-coated aluminum Rings fold flat for off-season storage