Creative Hobbies Value Pack of 4 Sponges for Painting, Crafts, Grout, Cleaning & More, Synthetic Silk Sponges, BIG 7.5 inch x 5 inch x 2 inch thick Creative Hobbies Value Pack of 4 large Synthetic Poly Sponges for working with clay, crafts, grout, and clean-up tasks. Our sponges could very well be the perfect size: BIG 7.5 inch x 5 inch x 2 inch thick Synthetic material is soft and absorbent and finishes clay smoothly. Easy to hold and long lasting. Shipped compressed to save space, sponges expand with water or exposure to air.