Thank you for viewing! This is a tap cover. It will be sent via anonymous delivery in a simple envelope. [Product Contents] Set of 4 Size: Opening: Approximately 12mm Total Length: Approximately 25mm The shaft in the photo is a 11.8mm carbon shaft. It doesn't feel like a perfect fit, so I think it can be used with a slightly thinner cue. I think it can be used up to about 13mm. It's made of soft silicone rubber, so it won't get stuck. It's a good idea to have spares. Perfect for small gifts at the billiard hall! [Product Description] Unless it's too loose, it won't come off easily. There seem to be longer ones, but if they're too long, they can actually dirty the shaft and make it difficult to remove, so around 25mm, which can cover just the ferrule, is just right. [What is a Tap Protector?] A tap protector covers the tap, protecting it and also protecting it from humidity. It also prevents chalk stains on the cue case. It's common to put the shaft in the cue case with chalk on it, but if you continue to do this for many years, chalk dust will accumulate in the cue case, causing chalk to adhere to the cue case and shaft, which can also cause the shaft to get dirty. Item... Supplies Type... Tap Cap Billiards Shaft Tap Cap 4 pieces 1 set