You only need to roll off the old cup Gaskets and put the new on Simple installation can keep the cup clean as usual It recommended that you replace the silicone lid seals every three months, which not only maintains the sealing, but also prevents the residues of dirt and make your cup likes new Make of food grade silicone materials that is safe to use, easy to clean, leakproof, heat insulated Sufficient quantity: you will receive 10Pcs replacement lid seals, enough quantity for daily needs and replacements You can replace our silicone lid Gaskets to reform a good sealing effect on the cup and keep clean, while leakage