Michael Lewis pleaded guilty to conspiring to distribute and possess with intent to distribute more than 50 grams of a substance containing cocaine base, in violation of 21 U.S.C. §§ 841(a)(1), (b)(1)(A), and 846. The district court 1 departed downward from the Guidelines range and sentenced him to the statutory minimum of 120 months of imprisonment and 5 years of supervised release. On appeal, counsel has moved to withdraw and filed a brief under Anders v. California, 386 U.S. 738, 87 S.Ct. 1396, 18 L.Ed.2d 493 (1967), noting that some of Lewis’s codefendants received lower sentences than he did.

Lewis is foreclosed from challenging the length of his sentence, as he specifically requested a sentence of 120 months. See United States v. Nguyen, 46 F.3d 781, 783 (8th Cir. 1995) (defendant who explicitly and voluntarily exposes himself to specific sentence may not challenge that punishment on appeal).

Following our independent review, see Penson v. Ohio, 488 U.S. 75, 109 S.Ct. 346, 102 L.Ed.2d 300 (1988), we find no nonfrivolous issues. Accordingly, the judgment is affirmed. We also grant counsel’s motion to withdraw.