Used these lids with my kids I believe in the 90s. They seal the Impressions Stackable Tumblers very snugly. We are a family of spillers but these helped keep spills to a minimum. Set of 4, blue, plastic lids with silicone slot for slipping straw through. That little bit of extra - the silicone - is what helped with cutting down on spills. This auction is for only the lids. They are in good used condition, please review the photographs carefully. Smoke-free, pet-friendly environment. No refunds, exchanges, or returns. I love offers.