40 Pieces Economy Pack, the best value for money!If you are not satisfied the libre cover,we will make refund or replacement. Hypoallergenic adhesive: Latex-Free medical material, breathable and comfortable, leaves no residue on skin. Easy to Use & Easy to Read: Pre-cut back paper, easy to use these libre sensor covers by yourself, no need other help. Also, you can easily get a reading through the tape as normal. No Hole & No Stick in the center: Large size(diameter 3.55")freestyle libre adhesive patches but no hole and no glue in the center for full protection and easier change in case.(No stick to the sensor). Waterproof & Breathable & Long Stay: This transparent adhesive patches for Freestyle libre 1 2 & 3 is waterproof and breathable, it allows your skin freely breath while protects. and also its reliable sticky ensures a very long time use, keeps stay on over 14 days and 14 showers.