These are white fiberglass tubes. Lot of 10 They are about 15''-16'' long  *Please email me if you need a specific size* They are 8mm outside diameter (about 1/3 ") and 4mm inside diameter. They may also have a hole drilled in them approximately 1/4" from one end, going all the way through (see pic below). These are not precision cut. Some holes are a little off center.  They may have a grove cut around the outer diameter approximately 1/2" in from one end.