diff --git a/of.go b/of.go
index 11959fb..e3a2f4c 100644
--- a/of.go
+++ b/of.go
@@ -70,8 +70,8 @@ func OfMap[K comparable, V, T any](m map[K]V, unmapper func(K, V) T) <-chan T {
 }
 
 // OfSeq returns a channel containing all values provided by the iterator
-func OfSeq[T any](seq iter.Seq[T]) <-chan T {
-	out := make(chan T, 10)
+func OfSeq[T any](seq iter.Seq[T], buffer int) <-chan T {
+	out := make(chan T, buffer)
 
 	go func() {
 		defer close(out)
@@ -85,8 +85,8 @@ func OfSeq[T any](seq iter.Seq[T]) <-chan T {
 
 // OfSeq2 returns a channel containing the return values of the unmapper function
 // when provided with the values of the iterator
-func OfSeq2[K comparable, V, T any](seq iter.Seq2[K, V], unmapper func(K, V) T) <-chan T {
-	out := make(chan T, 10)
+func OfSeq2[K comparable, V, T any](seq iter.Seq2[K, V], buffer int, unmapper func(K, V) T) <-chan T {
+	out := make(chan T, buffer)
 
 	go func() {
 		defer close(out)