Sony MDR-XB70AP in-ear stereo Headphones apbn/pn Base Booster 12mm driver~Black GENUINE and ORIGINAL Packing same as Pictures. Hybrid silicone earbuds prevent audio leakage while maximising comfort. An ultimate in-ear stereo headphones for extra bass and loudness Packed in its small aluminum housing are the all new Powered Bass Duct and specially designed 12mm driver units for mind-blowing bass performance.