Stainless Steel Hollow Tunnel Silver Sparkles Ear Expander Ear Plugs Surgical grade black stainless steel. Highly durable and biocompatible. Comes in sizes 00g, 7/16", 1/2", 9/16", 5/8", 3/4", 7/8", and 1". Hollow tunnel or hollow post design. Shimmering silver sparkles.