The No! Slip Martingale Adjustable Collar with Buckle Display contains 32 pieces and includes 2 each of an assortment of Martingale nylon collars with buckles in 4 colors and 4 sizes (10-12" x 3/8", 14-18" x 5/8", 18-22" x 3/4" and 22-29" x 1"). The No! Slip Collar is great for dogs that easily slip a collar. The limited closure prevents the collar from becoming too tight and the buckle allows easy adjustment and on/off use. "Coastal reserves the right to ship kits incomplete with no substitutions."