Classic coffee cup lids. Prevent your drinking from spilling out and dust. Keep it stay warm or cold for longer.;FDA approved food grade silicone,safe to use. Suitable for ceramic,glass,plactic and paper cups,not for strainless steel cups.;Package with 4pcs with different vibrant colors for replacement.;Reusable,no more waste.;Purchsing tips : Common cup rim/mouth(straight)- inner diameter about 84-87mm, outer diameter about 89-92mm,thickness about 2-3mm ; Special cup rim/mouth(with an extension), inner diameter about 86-88mm, outer diameter about 90-93mmm, thickness about 1-2mm.