Hydro and Sensei are just different strains of weed I wouldn't recomend smoking that strong of weed your first few times you might freek out. Hemp paper are just like regular rolling papers that are made out of no-thc(the chemical that gets youhigh) parts of the plant. Prices vary from place to place but are some prices.
1/8=15$-40$ 1/4=25$-100$ 1/2=50$-190$ 1 ounce= 100- 350.