Creative Hobbies Synthetic and Natural Silk Sponges for Painting, Crafts, Ceramics, Pottery and More, Value Pack of 7 Sponges 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, 3 three 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.