Which letter blends are included?
bl, br, ch, ck, cl, cr, dr, fl, fr, gh, gl, gr, ng, ph, pl, pr, qu, sc, sh, sk, sl, sm, sn, sp, st, sw, th, tr, tw, wh, wr, as well as a few trigraphs and a few ending sounds.
These flash cards would be great to laminate and use frequently.
You could also use them with letter flash cards to build words or with playdoh if you have a hands on learner to build the letter blend. If you have a child who learns from writing, laminate them, and have them write them with a dry erase marker. This will give you the freedom to erase them and let them use them again in the future.