Wig unit density describes how thick or thin a wig is, with 130% usually being the lowest, and 250% being the highest in some cases. 180% density is the preferred standard for regular wig wearers, which is almost the equivalent of 3 bundles.
The longer the hair, the higher I would suggest for density.
What products do you recommend to use to maintain my hair?
When maintaining your units, keep in mind the principle of "less is more." Heavy weight products or using products every day will cause buildup and can also weigh the hair down. You want to treat your units with love, just like your natural locs.