Essentially a souped-up Special 20, the Rocket is a 10-hole diatonic harp with some fabulous features: The plastic comb is rounded on all edges and on the hole openings — this makes for a smooth feel. The fully recessed reedplates (with forward shifted coverplate screws) make for an airtight seal that is easy on the lips. The coverplates are wide open in the back for LOTS of volume. These feel great, play great and are LOUD.