An ingenious and effortless way to clean the inside of bottles and other containers with narrow openings. These bean-shaped sponges contain alumina ceramic balls inside, which add weight allowing for a truly impressive kind of clean. Simply insert the sponges, a little water, and a drop of soap; then cover and shake away. It's really that easy. String can be tied to sponge at hole on top to enable pulling dropped sponge through extra narrow openings. 4 sponges - 2 x set of 2 Easy Cleaning For Narrow-Mouth Bottles It is great for cleaning reusable water bottles and plastic bottles, glass jars, containers, and even baby bottles! String can be tied to sponge at hole on top to enable pulling dropped sponge through extra narrow openings. Convenient and Safe To Use Alumina ceramic balls in the beans gives them a hefty weight, so to clean inside of the bottles or containers just takes a few shakes! Simply insert the sponges, a little water, and a drop of soap; then cover and shake away. It's really that easy. Bean-Shaped Bottle Cleaning Sponge, Set of 2 Bean-Shaped Bottle Cleaning Sponge, Set of 4 Bean-Shaped Bottle Cleaning Sponge, Set of 6 Silicone Tip Chopsticks, 25 cm Add to Cart Add to Cart Buying Options Add to Cart Customer Reviews 4.6 out of 5 stars 358 4.4 out of 5 stars 113 4.1 out of 5 stars 31 4.1 out of 5 stars 33 Price $12.75$12.75 $18.95$18.95 — no data $13.25$13.25 Color Green Green Green Yellow Units Included 1 x Set of 2 2 x Set of 2 3 x Set of 2 1 Set Heat Resistance Up To 158 °F / 70 °C Up To 158 °F / 70 °C Up To 158 °F / 70 °C Up To 392 °F / 200 °C About Marna Marna started as a brush manufacturer in 1872. Today, Marna’s product line covers kitchen, bath, cleaning, health and beauty care and stationery. Marna’s philosophy has always been to design and manufacture products that meet the needs of diverse individuals in a way that enriches their everyday lives. With over 140 years of experience and passion, Marna remains at the forefront of the housewares industry in Japan and continues to expand across the globe. Marna strives to bring smiles through thoughtfully-designed products that last a lifetime.