These sand-able foam cylinders are the perfect density for shaping popper and other bodies. You can color them with our Chartpak or Copic color markers. The cylinders have a subtle spiral ribbing-like ridge that can be left as-is or sanded off. Cylinders in the 1/8 in.size are at least 1 in. long, others are 1.6 in. in length. Size 1/8 in. comes 10 per pack, 1/4 in.and 3/8 in. sizes come 6 per pack and larger sizes come 4 per pack.