SEN-NIT XL, L, L, LM, M, H are pure water white, non-yellowing, water soluble oils; meaning that if any of them come in contact with the knitted goods, they are easily and effectively washed out with ordinary cold tap water. The SEN-NIT oils have tremendously tenacity, and will not fly off, run off or drip off. Therefore, they will last many times longer than petroleum knitting machine oils. SEN-NIT is available in five grades: extra light, light, light medium, medium and heavy.