Lyra Aquacolor look very similar to the wax crayons you probably used as a kid. They are about the same size and have a pointed end. They have a slightly creamier texture when you use them, but they are not as soft as oil pastels.
Lyra AQUACOLOR Aquarell - Tin of 48 A water-soluble wax crayon which suits highest creative demands. LYRA AQUACOLOR crays on extremely highly pigmented, resulting in colour brilliancy and high lightfastness. They are water-soluble and easy to blend, allowing an almost unlimited range of shades. Tin cover may vary.
Lyra Aquacolor Water-Soluble Crayons 24-pkg-assorted Colors
Different ways of using water soluble CRAYONS - tutorial by Sharon
Lyra Aquacolor Water Soluble Crayons Set of 24
Lyra Aquacolor Crayon Set, 12-Colors