Engineering Fundamentals and Problem Solving

Kidding Pets Waterproof Martingale Collar for Dogs,Easy to Clean Dog Collars with Safety Quick Release Buckle,Rubber Collar for Medium Large Dogs Walking Training (Orange, M (16.5-20.8inch))

Soft Leather Martingale Dog Collar - Adjustable Rose Gold Limited Slip Collars [Easy to Clean], Stylish Durable Heavy Duty Nylon No Pull Training Collar for Small Medium Large Dogs M Purple

Hikiko Martingale Collar for Dogs with No Buckle Floral Daisy Dog Collar Soft Nylon No Pull Dog Collars for Medium Dogs,Green Flower,M

Alvalley Martingale Collar for Dogs - Show Chain Dog Collar - Made of Brass - Safe, Easy to Handle - Suitable for Showing, Training, and Walking - Perfect for Small, Medium, and Large Pets

FunTags Reflective Martingale Collar for Dogs, Quick Release Buckle, 5FT Double Handle Dog Leash Padded, Dog Collar and Leash Set, Adjustable for Medium Dogs (Hotpink, M)

CollarDirect Martingale Dog Collar with Stainless Steel Chain and Quick Release Buckle - Reflective Collar for Large, Medium, Small Dogs - Pink, Large (Neck Size 17"-22")

Dazzber Martingale Dog Collars Colourful Oil Painting Pattern Series - No Pull Pet Collar Silky Soft for Medium and Large Dogs (Medium, 1 Inch Wide, Ecological Oasis)

iBrightstar 9-30V Extremely Bright Low Power 168 175 194 2825 W5W T10 Wedge LED Bulbs for Side Marker Light,Amber Yellow