diff --git a/mass/mass.go b/mass/mass.go
new file mode 100644
index 0000000..79dd703
--- /dev/null
+++ b/mass/mass.go
@@ -0,0 +1,50 @@
+package mass
+
+import (
+	"math"
+)
+
+type Mass struct {
+	batchSize    int
+	count        int
+	currentCount int
+	times        int
+	currentTimes int
+}
+
+func New(count, batchSize int) *Mass {
+	mass := new(Mass)
+
+	if count < 0 {
+		count = 0
+	}
+
+	if batchSize <= 0 {
+		batchSize = 1
+	}
+
+	mass.count = count
+	mass.batchSize = batchSize
+	mass.times = int(math.Ceil(float64(count) / float64(batchSize)))
+	return mass
+}
+
+func (mass *Mass) Iter(start, length *int) bool {
+	roundSize := mass.batchSize
+
+	if mass.currentTimes != 0 {
+		*start += *length
+	}
+
+	if *start+roundSize > mass.count {
+		roundSize = mass.count - *start
+	}
+
+	mass.currentCount += roundSize
+	*length = roundSize
+
+	mass.currentTimes++
+
+	return *start < mass.count
+
+}