This 14pc Deluxe Flat-Ended Sound kit is a great for kit for beginners or advanced users of urethral play. This kit contains 14 pieces of chrome-plated brass urethral sounds. The sounds range from 4 mm to 17 mm in diameter. They are flat on one end for easy gripping or electro play. Comes in a black velvet lined zippered case for easy storage and for travel.