Creative Hobbies value Pack of 7 Natural Seas and Synthetic Poly Sponges for working with clay, crafts, watercolor painting and more. Our 7 piece sponge assortment could very well be the perfect do all assortment for arts & crafts. Use for watercolor washes or soaking and stretching papers and are excellent for pottery making. Includes 1 four inch wool sponge, three 2.5" inch synthetic round sponges and 3 natural silk sponges 2-2.5 inches Shipped compressed to save space, sponges expand with water or exposure to air. Creative Hobbies value Pack of 7 Natural Seas and Synthetic Poly Sponges for working with clay, crafts, watercolor painting and more. Use for watercolor washes or soaking and stretching papers and are excellent for pottery making. Includes 1 four inch wool sponge, three 2.5 inch synthetic round sponges and 3 natural silk sponges 2-2.5 inches. Shipped compressed to save space, sponges expand with water or exposure to air.