Yontree Sharpening Stones Whetstone Stone Set Grit 180# 400# 800# 1500# For Sharpener System Material: white corundum Size: 5.90" x 0.78" x0.19" Quantity: 1 set (4 pcs) The whetstones are Light, portable, and Anti-friction For sharpening kitchen knife, scissors, chopper, hand hay cutter, shave knife, axe etc.