The 1oz bottle is a boston round style that is made of low density plastic, has a curve from the bottle reservoir through to the neck allowing material to easily flow out from the top and is very easy to squeeze. The blue luer lock cap threads onto to the bottle and then accepts any lure lock needle. Ideal for flux, solvents, adhesives and solder mask. 1 oz bottle neck size is 20-410 size. 10 bottles and caps per packager.