Earrbond EBT Ear Tips Available in two different sound tunings Copper sleeve or stainless steel sleeve Silicone shield, memory foam The visually appealing EBT ear tips from EarrBond are available in two different versions. With copper tubes or with stainless steel tubes.The different metals have an effect on the sound, giving you the opportunity to customize your IEM to your preferences. The construction of both variants is otherwise identical: Metal tubes, memory foam and silicone shield SS - Series (Stainless Steel) Metal Series The EBT Metal Series from EarrBOND is a hybrid design For the Stainless Steel Series, a medical steel 304 is used. Due to the hardness of the material, the sound signature will provide a more solid and full-bodied experience. The metal tubes provide a good controlled sound radiation CU - Series (Copper) The metal tubes of the CU Series are made of two materials Gold plated OFC (Oxygen Free Copper). The combination of these two metals ensures an intense and smooth reproduction over the entire frequency response. Specifications Small Outer diameter 10.5mm Tube diameter 4mm Height 8.8mm Asian Fit Outer diameter 11mm Tube diameter 4mm Height 12mm StandardOuter diameter 12.5mm Tube diameter 4mm Height 12mm