diff --git a/sdk/telemetry/id.go b/sdk/telemetry/id.go
index 7245d9fbb..438581611 100644
--- a/sdk/telemetry/id.go
+++ b/sdk/telemetry/id.go
@@ -17,19 +17,6 @@ const (
 // TraceID is a custom data type that is used for all trace IDs.
 type TraceID [traceIDSize]byte
 
-// String returns the hex string representation form of a TraceID.
-func (tid TraceID) String() string {
-	return hex.EncodeToString(tid[:])
-}
-
-// Size returns the size of the data to serialize.
-func (tid TraceID) Size() int {
-	if tid.IsEmpty() {
-		return 0
-	}
-	return traceIDSize
-}
-
 // IsEmpty returns false if id contains at least one non-zero byte.
 func (tid TraceID) IsEmpty() bool {
 	return tid == [traceIDSize]byte{}
@@ -53,19 +40,6 @@ func (tid *TraceID) UnmarshalJSON(data []byte) error {
 // SpanID is a custom data type that is used for all span IDs.
 type SpanID [spanIDSize]byte
 
-// String returns the hex string representation form of a SpanID.
-func (sid SpanID) String() string {
-	return hex.EncodeToString(sid[:])
-}
-
-// Size returns the size of the data to serialize.
-func (sid SpanID) Size() int {
-	if sid.IsEmpty() {
-		return 0
-	}
-	return spanIDSize
-}
-
 // IsEmpty returns true if the span ID contains at least one non-zero byte.
 func (sid SpanID) IsEmpty() bool {
 	return sid == [spanIDSize]byte{}