Shells, Backs, Molds & Washers #30 Durasnap $14.25 #40 Nylon Plastic Buttons (white) $23.76 Joined Pivot Buttons $47.86 Loop Eye Button Backs & Shells $3.55 – $19.68 No-Dent Corrugated Nail Back $19.26 – $48.59 Nylon Hook Backs $5.04 – $32.11 Prong Backs $18.48 – $24.01 Round Spring Washer $12.30 Threaded Nail Backs $18.56 – $22.30 Tufting or Prong Washer $15.59 Unassembled Nail/Tack Molds $11.46 – $12.60