these are threaded in 1/2 inch by 20 teeth per inch UNF thread standard 

they measure 45mm long by 22 mm in diameter approx

with a 7 mm exit hole 

i have other listings for other styles and colour

the white bubbles are polystyrene balls used to stop it rolling around during photography 

they are not any illegal substances , and are not for sale or included in the offer 

smoking polystyrene is hazardous to health and is not advised 

SUITABLE FOR .22 RIMFIRE OR .22 AIR RIFLES ONLY 

ebay 

having checked your listing conditions ,, these are not on it 

they do not carry any offensive symbols or markings 

do not promote acts of violence or cause birth defects 

and are not radioactive 

they are not part of any firearm upper or lower or form any part of a trigger/ fire control group 

they cannot alter any weapons rate of fire or be altered to