Amazon.com description: Product Description: Take It to Your Seat Phonics Centers, Level D is an instructional must-have in 2-3 classrooms. The 14 full-color centers stored in envelopes provide engaging, independent practice of the phonics skills presented. Center topics include: sounds of oo, sounds of c, g, and s and sounds of ch. Voiced/unvoiced th, dipthongs: oi, oy, ou, ow and silent letters: b, h, k, n, w, g, c, l, t and 1-,2-,3-,4-syllable words. Vowel digraphs, -long a: ai, ay, eigh and -long e: e, ea, ey and -long i: ie, uy and -long o: oa, ow, oe and -long u: ew, ue. Rhyming words, word families: -ead, -ew, -ain, -air and word families: -udge, -ight, -ound, -ore. Plurals, inflectional endings, prefixes: dis-, re-, un- and suffixes: -ful, -less, -ly.