KBEAR KS2The KS2 is a hybrid IEM with a 10mm Composite Diaphragm dynamic driver producing the low to mid frequencies and a balanced armature for highs. Second, any ink waste that results from the combined color cartridges is minimal compared to the "waste" generated from separate color cartridges. I love this AirPod case cover. Havent had it long enough to rate battery life. The block was fine. Overall good product, excellent customer service. These aren?t the same as the original pads from Bose. However, these are a god sent as they help me so much, I also changed to Nike Air as I read that also helps with plantar fasciitis. (But not really because it?s mine and stealing is BAD)The biggest pain point I have when buying shoe racks is the space between the shelves. I bought these for my granddaughter to wear this summer.