Schwalbe Durano foldable 1.1, 28mm - light, fast road tire , no flats for 2000km on good asphalt, makes my drop bar-ed 26er to feel almsost like a road bike, i use them for exercising for climbing a couple a short steep hills with less traffic. Discontinued in 2020.
Continental Grand Prix foldable 1.1, 28mm - light, fast road tire , rated better in rolling resistance test than the Durano, but i couldnt find much difference between them, 2000km no flats on good asphalt. Excellent option if you want your drop bar-ed 26er to feel almost like a road bike.
Geax/ Vittoria Street runners 1.25, 32mm - solid slick but heavy, because of extra material for protection, sold them because they were not as fast rolling and light as the 1.1 tires , nor as comfortable as a wider tire.
Geax/Vittoria Street runners 1.6, 40mm , a bit heavy because of extra material for protection, but quite comfortable, ok for mixed terrain- asphalt and some gravel off the road.