Walnut Media Pretreated 12/20 (5LBS.)

You Receive One 5 Lb. Polly Gusseted Bag Of Brass Worlds Pretreated (No Polish Needed)Walnut Media 12/20(STOP RUNNING YOUR POLISHER FOR HOURS) WITH BRASS WORLDS PRETREATED MEDIA. YOU CAN CLEAN & POLISH MOST BRASS TO A HIGH LUSTER MATCH GRADE FINISH IN 90 MINUTES OR LESS. (DRAMATICALLY INCREASING THE LIFE OF THIS MEDIA.)

Crushed walnut shells are extremely durable, angular and multi-faceted, yet considered a 'soft abrasive'.
Excellent durability; reusable

Cleaning Your Brass Will Help Reduce Wear And Tear On Your Expensive Reloading Dies,And The Chamber Of Your Firearm.

Grit And Grime From Uncleaned Brass Gets Embedded In The Inner Surfaces Of Sizing Dies, Scratching & Marring Every Case There After. The Same Grime Will Accelerate Wear In The Chamber And Feeding System Of Your Rifle Or Handgun.

Biodegradable
Non-toxic - no health or environmental hazards
Excellent media for tumbling and vibratory operations
Reduces cycle time of finishing operations
The Numbers:
In the case of 12/20 the 12 designates that the media is going through a screen that has 144 holes per square inch (12x12=144) and the 20 designates the screen size per square inch (20x20=400) that the media rests on after going through the 12x12 size screen described above.