Two Types of Memory Foam Ear Tips (Left) - Type: Memory Foam Ear Tip - Size: Standard Size Approximately 12.5mm x 12.5mm - Joint: 5.5-6mm - Material: Urethane - Manufacturer: FSC Co., Ltd. (Right) - Type: Memory Foam Ear Tip - Size: Standard Size Approximately 10.5mm x 9mm/11mm - Joint: 4.9mm - Material: Polyurethane / Silicone - Manufacturer: CS Co., Ltd. These have been in storage. I remember using only one set of the urethane ones on the left. The ones on the right are unopened. Please check the photos on the back for specifications.