MRF Nylogrip Zapper Y 100/90 x 18 is city tyre and comes as stock the stock tyre on quite a few motorcycles, including the earlier 18” versions of Pulsars and Karizma.
It has a decent tarmac grip, however in the starting the grip is a bit bad, but it gradually improves after 4000-5000 kms.
Straight line stability is good in dry and as long as there is no gravel on road, however in case of gravel or wet condition, the tyre looses grip quite easily. Cornering capability of this tire is also quite good, as long as the tarmac is good and warm and there is no gravel or water.
Overall Nylogrip Zapper Y is a decent choice as long as you are commuting in the city and don’t ride aggressively, especially considering the fact that the tyre is light, has a good life (used it for over 20k and could have used it more) and isn’t quite prone to punctures.