EC Flexible projectiles are made of medium density Polyurthane foam. The material is homogenieous and do not leave fibrous. The cleaning resultat is very good. Will negotiate right angel bends, coils and pipe reductions. Exrtremely copressible, up to 50%. Free of PVC, PTFE, Silicone and fluid. Follow our recommendations to select right projectile or feel free to make your own choose of a larger projectile, up to 100% of the innerdiameter to obtain best possible resultat. Also used as coupling projectile.