These are 7" 45rpm paper inner sleeves with a hole. The inner sleeves have square corners and are made from 20# heavy-weight paper. These sleeves are archival quality: acid free, and alkaline free! The paper used to make these are also certified by the Sustainable Forestry Initiative, and made with 30% post consumer waste. Replace your worn out or torn inner sleeves and freshen up your collection. These go over the naked vinyl record and slide into a jacket or outer sleeve.