After 3 years of development and over 25 prototypes, Keene Engineering developed the perfect concentrator riffle. The first Hungarian riffle molded into a soft rubber mat is now included in many Keene products. See the amazing recovery of micro fine gold that this mat produces. In some application this miracle mat sits under a classifier screen that is placed at the head of the sluice box. Spot ultra fine gold easily and quickly by checking the Miracle Mat.
**ORDERING INSTRUCTIONS: Select the number of inches (25.4 mm) you need by entering that number in the Quantity field.