Thank you very much for viewing! This product is a runner that can be attached to a Bauer tuuk holder. The types are LS1 and LS2. The thickness is not that great due to the number of times it has been sharpened, but you can still skate with it. However, whether it's suitable for competitive use depends on the individual. For those who do freestyle, you can get a feel similar to t-blade, so you might want to try it as a reference. Please note that this is a used item, so we kindly ask for your understanding with the 3N rule (no returns, no refunds, no exchanges). We are also waiting for your comments and requests!