Pulsar glass screens are a great accessory for adding to bowls and pipes to help keep users from inhaling hot ash. Works great with pipes that have a large inhale hole. The screens have a 3-pointed jack shape and a 6-7mm diameter with a 7mm height. Sold as a 300 count jar with a threaded jar lid. Pulsar Glass Screens Features: Size: Small | 6mm - 7mm 300 Assorted Screens Borosilicate Glass Material Assorted Colours (Colours Vary)