The SewTites Machine Mix packs contain a combination of models for machine embroidery, bagmaking, garment making, cosplay, and more – our Originals, HDs, and Magnums. The 12-pack is a great value for those who know they'll use allllll the SewTites. SewTites Specs: Original - 1.78 x .5 in (45 x 13 mm) with three strong earth magnets on back | HD - 2.125 x .5625"" (54 x 14.5 mm) with three very strong earth magnets on back | Magnum - 3.98” x .59” (101 x 15 mm) each with five stronger earth magnets on back |