These thick, soft alcohol swabs ensure reliable site preparation for safe, hygienic insulin injections. Individually wrapped in a four-layer foil wrapper to prevent leaking and drying out. Made with 70% isopropyl alcohol for optimum anti-bacterial action. Individually foil wrapped for convenience. 70% Isopropyl Alcohol for optimum anti-bacterial action. Four layer wrapper provides air-tight seal which prevents leakage and drying out.