Two-piece, synthetic base pad increases the cartridge capacity of pre-ban, Glock magazines without compromising reliability. Impact-resistant pad locks securely to the magazine body; removes quickly and easily with the supplied compression tool. Wolff, 10% extra power spring ensures reliable feeding. Checkered, bottom panel allows positive, non-slip, mag changes. Plus 5 extends pre-ban magazines to 140mm. Adds +6 rounds to 9mm, +5 to .40 S&W and 10 mm, and +4 to .45 ACP. USPSA Limited legal. Plus 3 meets the PPSC box rule. Adds +4 rounds to 9mm and +3 rounds to .40 S&W pre-ban mags. Available in black, blue and red. Mfg: Arredondo SPECS: Pad - High-impact, fiberglass-filled nylon. Black, blue, or red. 1½'''' (3.8cm) long, 1-1⁄8'''' (2.9cm) wide, 1½'''' high for 9mm/.40 S&W, 10mm/.45 ACP is larger. Spring - Tempered music wire, 10% extra power.