Our Groovy's are a great way to protect your records from dust. The inner cover is made of a transparent HDPE film and comes With a rounded bottom for a better fit. These are anti-static vinyl record sleeves and can fit into your 45's record sleeves and a paper sleeve. All our Groovy's come with a resealable bag. The HDPE sleeve as an anti-static additive which prevents the sleeve form sticking to the vinyl.