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Hello, I have multi-functional elastic aids that can increase soft PVC more soft (similar to human skin feeling) and have elasticity (similar to rubber texture). NBR is a nitrile rubber, NBR is not too good, because you joined NBR, soft PVC are opaque, after adding two NBR, soft PVC you will soon join the yellow, three NBR to increase the soft PVC you need to add more soft, large quantity; and the multifunctional elastic us the auxiliary agent is added after a solid block, will not affect the transparency of your two, not yellow, three amount is relatively small, so that high quality and inexpensive is a good Dongdong oh.