Letter Sound readers introduce the first 21 letter sounds. These readers have been written using a strictly controlled vocabulary. Text uses only decodable regular words (according to a week-by-week progression) along with tricky words . Tricky words are words frequently used that are not decodable. Set includes 12 fiction readers each with colorful illustrations. Phase 2 readers have a strictly controlled vocabulary that follows the letter-by-letter progression. Book Band - Early 1 (red); Guided Reading Level: A-C; Reading Level: 1-3.