This ultra-sleek round bottom sleeve is die-cut for a perfect fit over any 12 inch record, and is designed to fit inside of paper or cardboard sleeves. The design will allow you to easily glide an LP into the tightest fitting jackets like the Columbia jackets from the early '50s. We've tested this sleeve on many recordings including 200 gram audiophile vinyl to thin RCA Dynaflex records to insure quality fit. Since this sleeve is die-cut, every sleeve is perfectly sized at 12-1/8 in wide x 12 inches tall. A premium sleeve at a budget price, made in Taiwan by an audio accessory manufacturer exclusively for Sleeve City. We guarantee you'll love them!