31. Microspheres can be manufactured from various natural and synthetic materials . 32. Cavity-nesting red-shafted flickers, who like synthetic materials , pecked through the fake sandstone to roost. 33. Anything made of plastic or other synthetic material melts away. 34. Not until this century did inventors began to make plastics completely from synthetic materials . 35. The ball is a sphere of light material, covered with leather or synthetic material . 36. These seals are mostly manufactured from rubber or other flexible but durable synthetic materials . 37. There are many advantages to using the synthetic material as a vehicle for delivery. 38. Olation and oxolation are responsible for the formation of many natural and synthetic materials . 39. It is somewhat large for a pistol and is constructed mainly from synthetic materials . 40. The synthetic materials allow economic, predictable manufacture for consistent performance.
