I've made the ultimate converter lung for cosplay, but did I use too much silicone? The fine lines are a bit blurred, so I'm lowering the price. Lungs made of hard materials restrict movement and can damage suits. For example, try putting a cutting board or phone book in your chest and bending forward or backward. You'll find it's quite difficult to move. This is the ultimate converter lung made of urethane rubber sponge, cotton, silicone, and felt. It's been quite popular locally. Sew the lung to your suit around the edges, about 5mm in. If you can sew a rag, you'll be fine. Lung size (one side): approximately 41cm (length) / 23cm (width) / 5cm (thickness). Currently, it has a glossy finish, but you can make it matte by sprinkling baby powder and wiping it off with a damp towel. Current condition.